Under the Navy's Master Jet Base concept, all Type/Model/Series (T/M/S) aircraft were homebased at one field with associated intermediate maintenance and training facilities. In the 1960s, NAS Oceana became the home to all East Coast based F-4 Phantom II squadrons. Fighter Squadron 101 (VF-101) established a detachment at NAS Oceana in its role as the Fleet Readiness Squadron (FRS), formerly known as the Replacement Air Group or "RAG", that trained aircrews and maintainers to operate the Phantom (at the time, VF-101 operated out of NAS Key West, Florida). After the F-14 Tomcat arrived on the scene in 1976, VF-101 transitioned to Tomcat operations and Phantom training operations shifted to newly established Fighter Squadron 171 (VF-171) to handle Atlantic Fleet training for the F-4 Phantom until it was retired from service in 1984. The last F-14 was retired on 22 September 2006. At one time, in addition to fighter aircraft, all of the Atlantic Fleet's A-6 Intruder medium attack squadrons were also home-based at NAS Oceana, along with VA-42 as the associated Fleet Readiness Squadron charged with training all east coast A-6 pilots, bombardier/navigators and A-6 maintenance personnel. The A-6E was retired from the Fleet in 1997.