In 2006 the US Air Force awarded Boeing a contract worth north of $10 billion for 141 HH-47 combat search-and-rescue helicopters, but by mid-2009 the CSAR-X program was cancelled during its System Development and Demonstration (SDD) phase by the Pentagon. At the time Secretary of Defense Robert Gates wrote that this program had “a troubled acquisition history and raises the fundamental question of whether this important mission can only be accomplished by yet another single-service solution.”
That cancellation may have been warranted, but the underlying operational constraints are increasing as years go by, with a tentative replacement for aging helicopters that keeps slipping. In 2012, the Air Force got the green light to take another crack at it. The competition narrowed to a single bidder, and after wobbly budgetary announcements, the program was greenlighted. By the end of 2014 it was officially designated as HH-60W.