Tomahawk’s Chops: xGM-109 Block IV Cruise Missiles
Raytheon interview leads to substantial background upgrade, discussing current plans to add new capabilities to the US Navy’s Tomahawk missile fleet; Recent tests; Additional Readings sections updated & upgraded.
Block IV Tomahawk is the current generation of the Tomahawk family of cruise missiles. The BGM-109 Tomahawk family began life in the 1980s as sub-sonic, low-flying nuclear strike weapons, before being developed into long-range RGM/UGM-109 conventional attack missiles. They’re most frequently launched from submarines and surface ships, and have been the US Navy’s preferred option for initial air strikes in Iraq, Libya, et. al. Britain has also bought Tomahawk missiles, and launches them exclusively from submarines.
Block IV is the latest variant. It adds innovative technologies that improve combat flexibility, while dramatically reducing the costs to buy, operate, and support these missiles. That’s why the Block IV program, under US Navy PMA-280, has been one of the USA’s defense acquisition success stories over the last decade.
xGM-109: Missile & Launcher Types
Tomahawk missiles have become the US Navy’s major land strike missile. Indeed, March 2011 saw the 2,000th GM-109 Tomahawk fired in combat, from USS Barry [DDG 52]. The missile typically flies at 50 – 100 feet above ground using terrain-following radar, and navigates to its targets using a combination of GPS/INS, computer matching of the land’s radar-mapped contours to the missile’s internal maps (TERCOM), and final matching of the target scene (DSMAC). Once on target the missile can fly a direct horizontal attack mode, trigger preprogrammed detonation above the target, or use a pop-up and dive maneuver. CEP is often described as being about 10 meters.
There are 3 fielded variants.
The xGM-109C/D Block III missiles will serve in the US Navy until FY 2020, and can be fitted with either a 1,000 pound unitary conventional warhead (xGM-109C), or a conventional submunitions warhead with hundreds of smaller bomblets (xGM-109D). The Tomahawk Block III has a 750 nautical mile range. Unfortunately, mission planning requires 80 hours of work.
The xGM-109E Tomahawk Block IV achieved Initial Operating Capability in 2004, and current Pentagon plans will end purchases in 2015. Block IV reportedly increases missile range to 900 nautical miles, but it only uses the unitary warhead. Mission planning has been cut from 80 hours to just 1 hour, which makes a big difference to combat usage. The missile also has a 2-way UHF SATCOM datalink that allows the missile to be redirected in flight, or commanded to loiter over an area and wait for instructions from a Fleet HQ’s Maritime Operations Center.
Submarine Launch 109
Submarine-launched UGM-109 missiles are more expensive than their ship launched RGM-109 VLS counterparts, because the submarines’ launch mechanism is more involved and more strenuous. UGM-109 “all-up-round” storage and interface canisters come in 2 types: CLS and TTL. CLS canisters launch UGM-109s from vertical launch tubes installed on many of America’s Los Angeles Class (SSN 719 on), all Virginia Class, and all SSGN Ohio Class submarines. TTL canisters are used to launch Tomahawk missiles from a submarine’s torpedo tubes, which is Britain’s preferred method.
In both cases, a Tomahawk launches “wet”, unlike most anti-ship missiles. The canister remains in the vertical-launch or torpedo tube, while the missile is ejected. Once the UGM-109 has reached a safe distance from the submarine, its rocket booster ignites underwater to power it airborne. That booster falls away just before the missile ignites its jet engine. If the submarine needs to “clear the tube” for torpedoes, anti-ships missiles, mines, UUVs, etc., TTL canisters can be ejected into the sea after launch, as a separate evolution. In contrast, CLS vertical-launch canisters are only removed portside, when the submarine comes into base for servicing and reloading.
Tomahawk: The 2019 Evolution
There was a plan to develop a successor to the retired xGM-109B ship-killer by 2015, as an interim capability for the US Navy’s Offensive Anti-Surface Warfare (OASuW) program. That was shelved in the FY 2014 budget, as the Navy opted to drop the interim capability. Instead, they’re moving ahead with OASuW’s main xGM-84 Harpoon missile replacement program for air and sea launch, using the LRASM derivative of Lockheed Martin’s subsonic but stealthy AGM-158B JASSM-ER.
So, what’s Plan B for Raytheon?
The key to the next set of Tomahawk improvements is actually a warranty. The missile has a 15-year warranty and a 30-year service life, so 2019 will begin a recertification cycle for the fleet that could last until 2030. Threats continue to evolve, so why not add some missile upgrades while they’re back in the shop anyway? The US Navy already has a specifications sheet of possible improvements, and they’ve done a number of capability studies.
Raytheon is still talking to the Navy about that final package, which will break down into 3 broad categories.
Anti-Access/ Area Denial Communications Suite. Saddam Hussein had a sophisticated anti-aircraft system, but he didn’t have the kind of high-end jamming and emissions triangulation capabilities expected of future opponents. The challenge is twofold: keep the enemy from cutting off your communications, and keep your communications from alerting the enemy.
One option that has been mentioned in public involves adding a Line Of Sight datalink capability. The flip side of that move would involve training and tactics changes that push missile control farther down the command chain. That may be necessary, but is the US Navy comfortable doing that? There’s more to these A2/AD-CS discussions than just picking technologies.
Autonomy. The Tomahawk is already an autonomous weapon, in the sense that it can be fired and left alone. To remain relevant, it needs to add dynamic terminal autonomy: the ability to acquire targets on its own and hit them, even if the target is moving or has moved. It would also be useful to expand the missile’s navigation autonomy, by offering backups for hardened SASSM M-code GPS.
Both kinds of upgrades are being contemplated. Early tests that aren’t autonomous involve Rapid In-flight Target Update, which allows units that have a lock on a target to transmit rapid final scene updates for the missile’s DSMAC guidance. This is still done via Fleet HQ as Standard Operational Procedure, but that’s enough to hit moving targets in some circumstances. Ships become vulnerable if the targeting platform can survive their defenses, and the same is true for land-based air defense systems that can repeatedly move to new fixed locations.
Raytheon and the Navy are looking ro more, with a focus on mature technologies to cut down program risk. An ESM system for noticing and geolocating emissions has already begun testing. Raytheon personnel stress its quality, to the point that Navigation via Signals of Opportunity might be possible as a backup to GPS. During the attack run, ESM can allow the Tomahawk to home in on an active enemy ship or air defense radar, or even on other intercepted signals. That begins to add autonomous moving target capability, and the firm plans to take the next step by flight testing a dual-mode ESM/ active radar seeker system before the end of 2014. Finally, passive visual spectrum (camera or imaging infrared) guidance has also become popular for long-range strike missiles, because it doesn’t give the missile’s location away by creating electro-magnetic emissions. Raytheon has confirmed that CCD/IIR upgrades are also under consideration for Tomahawk, but stressed that no final decisions have been made about a future guidance package.
Core Strengthening. All of these capabilities are great, but they demand more computer processing power, more memory, more onboard power, etc. The missile’s core will need redesigns, in order to keep up.
Raytheon had to develop a Multi-Function Modular Processor to handle those computing needs. Other efforts will look to add new technology, like the Joint Multiple Effects Warhead System (JMEWS) warhead to improve performance against reinforced targets like bunkers. Still other attempts will take advantage of existing upgrades. As an example of the latter, Block III introduced the ability to throttle the missile’s Williams F107-WR-402 turbofan, and Raytheon has been expanding its usefulness over time. It’s a capability that’s obviously useful for adjusting the missile’s time of arrival, or extending range, but the firm has recently been testing a “high speed dash” mode. It’s still subsonic, but it represents some impressive flying that close to the ground.
The Missing Link
Even after all of these upgrades, the Tomahawk is still a 1970s design that relies on low altitude to hide from radar. That isn’t really subject to change, even though downward-looking radars are proliferating on small AWACS planes and aerostat blimps, and radars on modern ships and air defense systems are taking big steps forward.
All of the Tomahawk’s proposed technologies are well and good, and they will expand the missile’s usefulness substantially. Adding them to thousands of existing missiles is very cost effective, and makes a great deal of sense. As budget crunches force the Navy to re-examine every aspect of their programs, however, the Navy will have to make decisions about the cost, capability profile, and limitations of every weapon in their arsenal. Raytheon is trying to position Tomahawk as best they can, but the final decisions will lie elsewhere.
Contracts & Key Events
Unless stated otherwise, US Naval Air Systems Command in Patuxent River, MD manages the contracts to Raytheon in Tucson, AZ. In general, these contracts aren’t competitively procured, pursuant to the “only 1 responsible supplier” exemption in 10 U.S.C. 2304(c)(1).
Key subcontractors include Lockheed Martin in Valley Forge, PA (Weapon Control System element), QinetiQ North America in San Jose, CA (Command and Control element), and Boeing Inc. in St. Louis, MO (Command and Control element).
March 4/14: FY15 Budget. The Navy unveils a preliminary budget request briefing. It doesn’t break down individual programs into dollars, but it does offer planned purchase numbers for the Navy’s biggest programs from FY 2014 – 2019.
The plan confirms 196 Tactical Tomahawk missiles in FY 2014, and proposes to end production with 100 missiles ordered in FY 2015. Source: US Dept. of the Navy, PB15 Press Briefing [PDF].
Feb 19/14: Datalink test. A Tomahawk Block IV missile is launched from the USS Sterett [DDG 104] on a loitering fire test:
“… [the missile] flew a preprogrammed route while receiving updates from a simulated maritime operations center and from advanced off-board sensors updating the missile’s target location. Throughout the flight, the missile maintained communications with all the command and control assets and provided updates on its location before hitting the target.”
Raytheon told DID that this is the first of many tests involving “off-board sensors”, though 2014 will also see a number of flight tests using new on-board ESM and radar sensors. Many will be captive-carry tests, using one of the US Navy’s T-39 Sabreliner modified business jets. Sources: Raytheon, “Raytheon, U.S. Navy test Tomahawk Block IV’s latest communications upgrades”.
Feb 14/14: Upgrades. Tomahawk program manager Capt. Joe Mauser tells Defense Tech that they’re working on a new Joint Multiple Effects Warhead System (JMEWS) warhead for the Block IV, in order to improve performance against reinforced targets like bunkers.
At the same time, Raytheon is working on a new active & passive dual seeker (q.v. Oct 7/13). Raytheon has been elbowed aside from the OASuW program, which is currently owned by Lockheed Martin’s stealthy LRASM-B. A low-cost upgrade that accomplishes some of OASuW’s goals offers Raytheon the opportunity to get some funds, keep their missile relevant for years to come, and position themselves as a weaker Plan B if further budget cuts remove their competitor. Sources: DefenseTech, “Navy Wants Its Tomahawks to Bust More Bunkers”.
Jan 14/14: #3,000. Raytheon announces that they’ve delivered the 3,000th Tomahawk Block IV missile, as part of FY 2012′s FRP-9 production contract. Sources: Raytheon, “Raytheon delivers 3000th Tomahawk Block IV to US Navy”.
Oct 7/13: ESM multi-mode. Raytheon announces a successful field test of a new multi-mode seeker technology that would add an advanced Electronic Support Measure (ESM) antenna and processor to the Block IV Tomahawk missile. Raytheon told DID that the system is based on the firm’s own technology, rather than being a direct offshoot of the attempt to add AARGM technology to the Tomahawk (q.v. April 27/12).
Raytheon is correct that the current Tomahawk is an open architecture ‘truck’ capable of integrating new payloads and sensors, and an ESM seeker is a helpful addition to recent improvements like the 2-way datalink. ESM would turn the missile into a radar and communications killer that could deal directly with enemy air defenses, and could begin to engage some kinds of moving targets. The challenge is that the missile still needs to survive long enough to hit its target, and the Tomahawk’s low-level flight isn’t enough to protect it from the kind of advanced air defenses that would make you want to use unmanned ESM missiles. Its best use case might be against enemy ships. Sources: Raytheon, “Raytheon demonstrates new seeker technology for Tomahawk Block IV missile”.
FY 2012 – 2013
April 17/13: UK. The US DSCA announces [PDF] Britain’s request to import follow-on support and keep their UGM-109 Tomahawk Weapon Systems (TWS) ready for use. Work can include missile modifications, maintenance, spare and repair parts, system and test equipment, engineering support, communications equipment, technical assistance, personnel training/equipment, and other related elements of logistics support.
The estimated cost is up to $170 million, but actual costs will be negotiated in a series of contracts. The principal contractors will be Raytheon Missile Systems Company in Tucson, AZ; Lockheed Martin in Manassas, VA, Valley Forge, PA, and Marlton, NJ; Boeing in St. Louis, MO; BAE North America in San Diego, CA; COMGLOBAL in San Jose, CA; and SAIC in Springfield, VA and Patuxent River, MD. Implementation of this proposed sale will require the assignment of 1 U.S. Government and 2 contractor representatives to the United Kingdom for the duration of this case.
DSCA: UK support request
April 10/13: FY 2014 Budget. The President releases a proposed budget at last, the latest in modern memory. The Senate and House were already working on budgets in his absence, but the Pentagon’s submission is actually important to proceedings going forward. See ongoing DID coverage.
News for the Tomahawk program is mixed. The OASuW Harpoon replacement program canceled plans for an interim solution based on the xGM-109 family, even as it plans to award Technology Development contracts in FY 2013. Raytheon will need to consider its competitive options carefully, as OASuW could grow to be a huge opportunity.
Within the existing Tomahawk program, yearly budgets are rising even though the number of missiles per year remains constant at 196. This is pushing flyaway cost for new missiles from $956,000 in FY 2013 to about $1.2 million. The extra funds are going to 2 areas: obsolescence replacement/ diminishing manufacturing sources, and restoration of planned missile improvements. The former category includes such key components as the Williams turbojet engine and the satellite datalink, and is important enough that FY 2011 – 2011 contract savings are being applied to address it. Improvements will begin with missile communications that will work even in jamming-rich or otherwise hostile environments.
March 11/13: UK. A $6.6 million firm-fixed-price contract modification for 4 torpedo tube launched (TTL) Tomahawk Block IV all-up-round missiles for the government of the United Kingdom under the Foreign Military Sales Program. All funds are committed immediately.
Work will be performed in Tucson, AZ (32.6%); Camden, AR (13%); Ogden, UT (10.5%); Dallas, TX (3.5%); Minneapolis, Minn. (3.3%); Glenrothes, Scotland (3.3%); Spanish Fork, UT (3.1%); El Segundo, CA (3%); Walled Lake, MI (2.6%); Anniston, AL (2.5%); Ft. Wayne, IN (2.3%); Ontario, Canada (2.2%); Vergennes, VT (2.1%); Berryville, AR (1.8%); Westminster, CO (1.6%); Largo, FL (1.5%); Middletown, CT (1.3%); Huntsville, AL (1.2%); Clearwater, FL (0.8%); Moorpark, CA (0.8%); El Monte, CA (0.6%); Salt Lake City, UT (0.6%); Farmington, NM (0.2%); and various continental U.S. (CONUS) and outside CONUS locations (5.6%); and is expected to be completed in February 2015 (N00019-12-C-2000).
4 for Britain
March 7/13: Support. A $12.8 million firm-fixed-price, indefinite-delivery/ indefinite-quantity contract for services in support of Tomahawk missile depot maintenance, including direct fleet support for resolving technical issues with forward deployed, in-theater weapons and inventory management for the US Navy and the United Kingdom.
Work will be performed in Tucson, AZ (70%); Camden, AR (24%); Commerce Township, MI (4%); Indianapolis, IN (1%); and various other continental U.S. (CONUS) and outside CONUS locations (1%) until February 2014. $2.4 million is committed immediately, of which $2.3 million will expire at the end of the current fiscal year, on Sept 30/12 (N00019-13-D-0002).
Jan 17/13: DOT&E testing. The Pentagon releases the FY 2012 Annual Report from its Office of the Director, Operational Test & Evaluation (DOT&E). The Tomahawk gets high marks. It continues to meet its standards, and remains operationally effective and suitable (maintainable).
The one thing Pentagon OT&E would like to see is restored flight testing of the Block III model, until it goes out of service in FY 2020.
Dec 18/12: CCLS. A $45 million firm-fixed-price contract modification from the USN for 120 Tomahawk Block IV Composite Capsule Launching Systems (CCLS), which are used to launch UGM-109s from vertical submarine tubes. All contract funds are committed immediately.
Work will be performed in Tucson, AZ (24.61%); Lincoln, NB (23.17%); Camden, AR (12.48%); Rocket Center, WVA (10.3%); Carpentersville, IL (8.74%); Joplin, MO (6.63%); Hopkinton, MA (4.76%); Huntsville, AR (4.37%); Alamitos, CA (2.05%); Torrance, CA (1.47%); Downers Grove, IL (0.75%); and Brooksville, FL (0.67%), and is expected to be complete in July 2015 (N00019-12-C-2000).
Dec 17/12: 252 missiles. A $254.6 million firm-fixed-price contract modification, exercising a US Navy option for 252 Tomahawk Block IV All-Up-Round (AUR) missiles: 132 RGM-109s designed to launch from strike-length Mk.41 cells on surface ships, and 120 UGM-109 CLS missiles that are fired from different vertical launch tubes installed on American submarines.
Work will be performed in Tucson, AZ (32%); Camden, AR (11%); Ogden, UT (8%); Anniston, AL (4%); Minneapolis, MN (4%); Ft. Wayne, IN (4%); Glenrothes, Scotland (4%); Dallas, TX (4%); Spanish Fork, UT (3%); Vergennes, VT (3%); Walled Lake, MI (2%); Berryville, AR (2%); El Segundo, CA (2%); Westminster, CO (2%); Middletown, CT (2%); Huntsville, AL (1%); Farmington, NM (0.2%); and various locations in the continental United States and outside the continental United States (11.8%); and is expected to be completed in August 2015. See also Raytheon.
FY 2013: 252
Sept 3/12: OASuW. Aviation Week offers a look into the Tomahawk’s potential future. In June 2012, the US Navy announced a sole-source contract to Raytheon to develop the interim Offensive Anti-Surface Weapon (OASuW) by modifying a Tomahawk Block IV missiles with new sensors and data links. The missile is expected to enter service by 2015… but it’s likely to face competition from Lockheed Martin’s LRASM-A, among others.
Full OASuW Technology Development awards are expected to begin in FY 2013, after a Q2 Milestone A decision. The technical Development phase runs from FY 2013 – FY 2017, to an expected total of $557.2 million. Initial Operational Capability is currently set for 2024.
July 12/12: CCLS. A $45.9 million firm-fixed-price contract modification, buying 123 Tomahawk Block IV Composite Capsule Launching Systems (CCLS) for the US Navy.
Work will be performed in Tucson, AZ (24.61%); Lincoln, NB (23.17%); Camden, AR (12.48%); Rocket Center, WVA (10.3%); Carpentersville, IL (8.74%); Joplin, MO (6.63%); Hopkinton, MA (4.76%); Huntsville, AR (4.37%); Alamitos, CA (2.05%); Torrance, CA (1.47%); Downers Grove, IL (0.75%); and Brooksville, FL (0.67%), and is expected to be complete in July 2014 (N00019-12-C-2000).
June 7/12: 361 missiles. A $337.8 million firm-fixed-price contract for 361 Tomahawk Block IV All-Up-Round missiles for the Navy. This includes 238 RGM-109E missiles that are launched from strike-length Mk.41 Vertical Launch System (VLS) cells on surface ships, and 123 UGM-109E missiles that are launched from submarines equipped with the Capsule Launch System (CLS).
Raytheon’s release says that the buy includes replenishment of weapons used during Operation ODYSSEY DAWN in Libya, as well as the FY 2012 buy.
Work will be performed in Tucson, AZ (32%); Camden, AR (11%); Ogden, UT (8%); Anniston, AL (4%); Minneapolis, MN (4%); Fort Wayne, IN (4%); Glenrothes, Scotland, UK (4%); Dallas, TX (4%); Spanish Fork, UT (3%); Vergennes, VT (3%); Walled Lake, MI (2%); Berryville, AR (2%); El Segundo, CA (2%); Westminster, CO (2%); Middletown, CT (2%); Huntsville, AL (1%); Farmington, NM (0.2%); and various locations inside and outside the continental United States (11.8%), and is expected to be complete in August 2014 (N00019-12-C-2000).
FY 2012 + Libya replacement: 361
April 27/12: New sensors? FBO.gov:
“The Naval Air Systems Command intends to negotiate and award a sole source order under Basic Ordering Agreement (BOA) N00019-11-G-0014, pricing arrangement cost-plus-fixed-fee, for engineering services necessary to support a study to assess the possibility of integrating, onto the Block IV Tomahawk weapon, Advanced Anti-Radiation Guided Missile (AARGM) technologies.”
The AGM-88E AARGM uses GPS to navigate to the target’s vicinity, then finds targets that are moving or have moved using a combination of emission-locating ESM and an active millimeter wave radar seeker. AARGM is meant to destroy enemy air defense systems, but a system for a missile of this size would also be able to target enemies like ships. ATK received a $452,000 contract on Aug 22/12.
xGM-109E Block IV TLAMs: A Program Success Story
Block IV missiles offer a number of improvements over previous versions: the missile’s purchase cost drops by almost half, to about $750,000, while lowering its future maintenance costs, and upgrading its capabilities.
Capt. Bob Novak, who was the Tomahawk All-Up-Round (PMA-280) program manager until August 2005, began leading the Tomahawk AUR program team in 2002 during a critical time in the development of the Tactical Tomahawk cruise missile. Under his leadership the program awarded the Navy’s first-ever weapons multi-year contract, and was estimated to have reduced the cost per missile from Block III to Block IV by almost 50%, saving $1 billion over planned lifetime costs while upgrading the missile’s capabilities. While reducing the Block IV Tactical Tomahawk’s purchase costs, improved design and manufacturing also reduced maintenance/ recertification requirements from once every 8 years for Block III missiles to once every 15 years.
PMA-280 was honored with several prominent awards, including the Secretary of Defense Value Engineering Award, the Daedalian Award, and the Ed Heinemann Award.
One important new capability that Block IV Tomahawk brings to the US Navy’s Sea Strike doctrine is derived from the missile’s 2-way satellite data link, which enables the missile to respond to changing battlefield conditions. The strike controller can “flex” the missile in flight to preprogrammed alternate targets, redirect it to a new target, or even have it loiter over the battlefield awaiting a more critical target. Block IV Tomahawks can also transmit battle damage indication imagery and missile health and status messages via the satellite data link, allowing firing platforms to execute missions in real time.
Global Positioning System-only missions are also possible in addition to the missile’s previous terrain-mapping guidance mode, thanks to an improved anti-jam GPS receiver for enhanced mission performance.
The majority of Tomahawk cruise missiles are currently launched by Navy surface vessels, such as the Ticonderoga Class (CG-47) cruisers and Arleigh Burke Class (DDG-51) destroyers. The later series of Improved Los Angeles Class (SSN-688I) and the newest Virginia Class (SSN-744) attack submarines are also armed with 12 dedicated Tomahawk launch tubes, while earlier Los Angeles boats and the newest Seawolf Class (SSN-21) have to sacrifice some of their stored torpedoes to carry and launch Tomahawks through their torpedo tubes. But the USA’s premier Tomahawk carrier vehicle in future will be the Ohio Class SSGN stealth strike subs, with launch capacity for an astounding 154 Tactical Tomahawks each.
Additional Readings & Sources
DID would like to thank Raytheon Tomahawk Program Director Roy Donelson, and Growth Program Manager Chris Sprinkle, for their assistance with this article. Any mistakes are our own damn fault. Readers with corrections or information to contribute are encouraged to contact editor Joe Katzman. We understand the industry – you will only be publicly recognized if you tell us that it’s OK to do so.
Weapon & Program Background
- US NAVAIR – Tactical Tomahawk
- Raytheon – Tomahawk Cruise Missile. See also their 2012 paper on the missile’s evolution from Block III: “Tomahawk: Serving the U.S. and Allied Warfighter“.
- Globalsecurity.org – BGM-109 Tomahawk
- DoN Acquisition One Source – Reducing Cost/Schedule for TOMAHAWK All-Up-Round Program
- Air Power Australia – Tomahawk Cruise Missile Variants: BGM/RGM/AGM-109 Tomahawk/TASM/TLAM/GCLM/MRASM. Last updated 2012.
News & Views
- DID – LRASM Missiles: Reaching for a Long-Range Punch. Covers the USN’s OASuW program, whose sea-launched component has already affected the Tomahawk program. The current plan is based around air and sea-launched adaptations of Lockheed Martin’s AGM-158B JASSM-ER.
- FAS Strategic Security Blog (March 18/13) – US Navy Instruction Confirms Retirement of Nuclear Tomahawk Cruise Missile. The xGM-109B Tomahawk Block II.
- Defense Daily (Nov 29/07) – Navy Seeks New Uses For Tomahawks. Covers a number of program developments, including the potential for thermobaric warheads.
- Naval Air Station Patuxent River Tester Magazine (April 12/07) – Submarine-launched Tomahawk IV flight test a success
- Naval Air Station Patuxent River Tester Magazine (Dec 14/06) – Tomahawk IV in West Coast Test. “The test successfully demonstrated the Tomahawk Strike Network. The Tomahawk Strike Network (TSN) is a unique aspect of the Block IV system. Utilized in this test, TSN is a communications network that provides secure connectivity among all of the participants in a strike plan. Those participants include the Block IV missile(s), the strike controller, and the missile controller. Messages are generated, sent, and received inside the network, and are monitored by a channel controller. TSN allows the strike controller to retarget the missile in flight, monitor the health and status of the missile in flight, and collect images along the route.”
- Naval Air Station Patuxent River Tester Magazine (Aug 10/05) – Tomahawk program marks historic milestone. Capt. Rick McQueen became the 1st program manager for the newly formed Tomahawk Weapons System Program Office (PMA-280), as the Navy’s All-Up-Round (PMA-280) and Cruise Missile Weapons Systems (PMA-282) groups merged.
- Naval Air Station Patuxent River Tester Magazine (Oct 7/04) – New Tomahawk ready for warfighter. Block IV was accepted by the USN on Sept 29/04.