American planes flying photographic reconnaissance over Normandy, France, in preparation for the Normandy Invasion, WWII, May 1944. They are flying the F-6A, the reconnaissance version of the P-51 Mustang. The 107th Observation Squadron, Michigan National Guard, one of 29 National Guard observation squadrons, became the first operational photographic reconnaissance squadron in Northern Europe in December 1943. Oil on canvas, by William S. Philllips, 1985.