Duff, Mach. "Mach Duff, Junior Mechanic" works for the Army Air Force at Clark Field. He has various bright ideas, like painting planes in plaid camouflage, and uses them and his natural inquisitiveness to fight the enemy and spies, on the ground and in the air. He's best buds with Power Dive Grant, one of the Army's best pilots.
First Appearance: Air Fighters Comics #1 (Hillman), Nov 1941. 1 appearance. Created by Gilbert James and Bob Oksner.
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