A (small!) selection of the aircraft at AirVenture 2013 Oshkosh
North American T-28B Trojan
The North American Aviation T-28 Trojan is a piston-engined military trainer aircraft used by the United States Air Force and United States Navy beginning in the 1950s. Besides its use as a trainer, the T-28 was successfully employed as a Counter-insurgency (COIN) aircraft, primarily during the Vietnam War.