Unofficially named the "Invader," the A-36A Apache dive bomber was the first U.S. Army Air Forces version of the Mustang (the Mustang was officially developed for Britain in 1940). The first A-36 flew in September 1942, and North American completed production of 500 A-36As in March 1943.
North American
A-36A Apache
The A-36A had a three blade propeller and was powered by an Allison V-1710 like the P-51, P-51A, and RAF Mustang I. The small air intake on the top forward fuselage just behind the propeller is a distinguishing feature of all Allison-powered Apaches and Mustangs.