One of the most adaptable aircraft I know of was the British DeHavilland Mosquito
There is nothing but grace, power and beauty in the North American P-51 Mustang, said by most to be the best all around fighter aircraft of the Second World War.
AC-130 - Afghanistan film
The Douglas A-1 Skyraider was the Apex single prop ground attack aircraft. Call sign "Sandy", they operated effectively in Korea and Viet Nam.
P-38 vs German railroads
AH-64 ground support/sniper suppression.