USAF also acquired a number of other USN aircraft originally designed for aircraft carrier use and pressed them into USAF service. This included the transfer of the piston-engine Douglas A-1 Skyraider in its A-1E and A-1H variants being retired from the Navy inventory in the mid 1960s for close air support, rescue aircraft escort, and special operations duties in Vietnam, as well as the Navy's LTV A-7 Corsair II light attack bomber in new production numbers, the USAF versions of which were designated A-7D and A-7K.