The Air Force competition specified a day fighter with no strike capability. In May 1974, the House Armed Services Committee redirected $34 million from the VFAX to a new program, the Navy Air Combat Fighter (NACF), intended to make maximum use of the technology developed for the LWF program. Redesigning the YF-17 Though the YF-16 won the LWF competition, the Navy was skeptical that an aircraft with one engine and narrow landing gear could be easily or economically adapted to carrier service, and refused to adopt an F-16 derivative. On 2 May 1975, the Navy announced its selection of the YF-17. Since the LWF did not share the design requirements of the VFAX, the Navy asked McDonnell Douglas and Northrop to develop a new aircraft from the design and principles of the YF-17. On 1 March 1977, Secretary of the Navy W. Graham Claytor announced that the F-18 would be named "Hornet". Northrop had partnered with McDonnell Douglas as a secondary contractor on NACF to capitalize on the latter's experience in building carrier aircraft, including the widely used F-4 Phantom II. On the F-18, the two companies agreed to evenly split component manufacturing, with McDonnell Douglas conducting the final assembly. McDonnell Douglas would build the wings, stabilators, and forward fuselage; while Northrop would build the center and aft fuselage and vertical stabilizers. McDonnell Douglas was the prime contractor for the naval versions, and Northrop would be the prime contractor for the F-18L land-based version which Northrop hoped to sell on the export market. The F-18, initially known as McDonnell Douglas Model 267, was drastically modified from the YF-17. For carrier operations, the airframe, undercarriage, and tailhook were strengthened, folding wings and catapult attachments were added, and the landing gear was widened. To meet Navy range and reserves requirements, McDonnell increased fuel capacity by , by enlarging the dorsal spine and adding a 96-gallon fuel tank to each wing. A "snag" was added to the wing's leading edge and stabilators to prevent an aeroelastic flutter discovered in the F-15 stabilator. The wings and stabilators were enlarged, the aft fuselage widened by , and the engines canted outward at the front. These changes added to the gross weight, bringing it to . The YF-17's control system was replaced with a fully digital fly-by-wire system with quadruple redundancy, the first to be installed in a production fighter. Originally, plans were to acquire a