The VF designation was one of the oldest in use by the U.S. Navy. From 1921 to 1948 it designated "Fighting Plane Squadron" or "Fighting Squadron". It designated "Fighter Squadron" from 1948 until 2006 when the last VF squadron was redesignated to Strike Fighter (VFA) squadron. The designation has not been used since 2006. During the time the VF designation was in use there were two periods during which a suffix letter was added after the squadron designation number. From 1927 to 1937 the suffix letter denoted to which fleet the squadron belonged; B for Battle Fleet and S for Scouting Fleet. From 15 November 1946 to as late as 1 September 1948 the suffix letter denoted to which type of Carrier Air Group the squadron belonged: A for those assigned to Essex class carriers (sometimes called "