After 1967, it would also have to defeat the next generation Soviet fighters as well. By 1966, the Navy had been persuaded that a single VFAX could meet the specification if it were large enough to carry the AWG-9/Phoenix weapons system. The VFAX was quickly dropped in favor of a hastily rewritten VFX specification which was largely built around the 303.
After 1967, the aircraft had to be able to defeat the next generation Soviet fighters. By 1966, the Navy decided that a single VFAX could meet the specifications if it were large enough to carry the AWG-9/Phoenix weapons system. The VFAX was quickly replaced by a hastily revised VFX specification which focused on the 303.