In December 1973, US Marine Corps officers reported to VF-124 to start training as instructors. USMC involvement continued until 1976 when it was decided that the F-14 was too expensive for the USMC to operate. The first set of replacements pilots trained by VF-124 took to sea in December 1974, flying day and night carrier qualifications of the deck of USS Kitty Hawk CV-63 (Wikipedia).