The 33d FW "Nomads" is the largest tenant unit at Eglin. The 33 FW is a joint graduate flying and maintenance training wing for the F-35 Lightning II, organized under Air Education and Training Command's 19th Air Force. First established as the 33d Pursuit Group, the wing's contribution to tactical airpower during its 50-year history has been significant with participation in campaigns around the world, while flying various fighter aircraft. Reactivated at Eglin on 1 April 1965 with F-4C Phantom IIs, the wing operated, successively, F-4D and E models into the 1970s before transitioning to the F-15 Eagle. As of 1 October 2009, the 33d FW transitioned to a training wing for the new F-35 Joint Strike Fighter (JSF). The final F-15s assigned to the 33d departed the base in September 2009. As the first of its kind in the Department of Defense, the joint wing is responsible for F-35 JSF pilot and maintainer training for the Air Force, Marine Corps and the Navy. The first of 59 F-35s arrived from Fort Worth, Texas on 14 July 2011.