The VMFA-531 "Grey Ghosts" was activated in 1942 as the Marine Night Fighter Squadron VMF(N)-531.  The unit, deployed to the South Pacific, was the first of any of the US services to participate in combat as a radar-equipped, night fighter squadron, and it pioneered Marine GCI and night fighter tactics.  The squadron was re-designated as the Marine All-Weather Fighter Squadron VMF(AW)-531 in 1948, and then as the Marine Fighter Attack Squadron VMFA-531 in 1963.  The unit is currently equipped with the F-4 Phantom II and is based at MCAS Cherry Point, North Carolina.