The U.S. Air Force issued a request for proposals (RFP) for its “high priority” combat rescue helicopter (CRH) acquisition on October 19. The RFP begins a second campaign to replace the service’s HH-60G Pave Hawk search-and-rescue helicopters. In 2009 the Pentagon cancelled the original replacement program, which had been awarded three years earlier to Boeing for the HH-47 Chinook, after successive contractor protests and delays.