The naval MK 41 Vertical Launching System (VLS) hides missiles below decks in vertical slots, with key electronics and venting systems built in. A deck and hatch assembly at the top of the module protects the missile canisters from the elements, and from other hazards during storage. Once the firing sequence begins, the hatches open to permit missile launches of various types. It is also being adapted for land use, as part of the USA’s plan to forward-deploy ballistic missile defense in allied countries.
The Mk.41 is the most widely-used naval VLS in the world, in service with the US Navy and with many countries outside the United States. Lockheed Martin is the system’s prime contractor, and BAE Systems Land & Armaments also makes components and canisters for the MK 41 system. In September 2011, however, the US Navy assumed the final integrator role.