Curtiss P-40E Warhawk: The Curtiss P-40E Warhawk was powered by a liquid-cooled Allison V-1710 engine. Used for testing modifications to the tail, this Warhawk was used by the NACA at Langley from March to July 1942.

P-40E Warhawk

Beaufighter Mk.VIf of the 416th Night Fighter Squadron at an airfield near Grottaglie, Italy, in November 1943. (US Air Force Photo)

US Beaufighter

Bell P-39D Airacobra: After initially seeing duty in the Pacific and European theaters of operation, P-39s were supplanted, then replaced by the P-38, P-47 and P-51. Many of the Bell Fighters made their way to the Soviet Union, while others, like this P-39D, were used in the Unites States. This Airacobra was flown by the NACA in early 1943. Note the engine located in the middle of the fuselage, and the cannon in the propeller spinner.