Sikorsky-Boeing Reveals DEFIANT X, Fastest and Most Advanced Assault Helicopter Yet Sikorsky, a Lockheed Martin Company, and Boeing has released details of its advanced helicopter for the U.S. Army’s Future Long Range Assault Aircraft competition, known as FLRAA. The aircraft, named DEFIANT X, will be the fastest, most maneuverable and most survivable assault helicopter in history. The Army is expected to release a request for proposal on FLRAA later this year, with a contract award expected in 2022. DEFIANT X is a complete weapon system that builds on the handling qualities and transformational capabilities proven by the team’s technology demonstrator, SB>1 DEFIANT. With unmatched range and survivability, DEFIANT X will to fly low and fast through complex terrain, land quickly, deliver soldiers and equipment to the objective area (referred to as “the X”) and get out.