 The US Navy Reserve's Tactical Support Wing (formerly Reserve Carrier Air Wing 20) uses tail code AF.NW was the tail code for Helicopter Wing Reserve which has been disestablished, but the two reserve helicopter squadrons which still exist continue to use that code even though the wing no longer exists.Helicopter FRS and helicopter squadrons not assigned to CVW (except for reserve squadrons) and all land-based fixed-wing squadrons use two letter codes unique to each squadron.