U.S. Air Force (1958-1965)		1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 15 (UK Version), 16, 17, 17 (UK Version), 18, 19, 19 (UK Version), 20, 21, 22, 23, 23 (UK Version), 24, 24 (UK Version), 25, 26, 26 (UK Version), 27, 27 (UK Version), 28,  29, 30, 31, 32, 33, 34, 35, 36, 37
U.S. Marines (1964)		1
Underdog (1970-1972)		1, 2, 3, 4, 5, 6, 7, 8, 9, 10
Unusual Tales (1955-1965)		1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 26 (UK Version), 27, 27 (UK Version), 28, 28 (UK Version), 29, 29 (UK Version), 30, 30 (UK Version), 31, 31 (UK Version), 32, 32 (UK Version), 33, 33 (UK Version), 34, 34 (UK Version), 35, 35 (UK Version), 36, 36 (UK Version), 37, 38, 38 (UK Version), 39, 40, 40 (UK Version), 41, 41 (UK Version), 42, 42 (UK Version), 43, 44, 45, 46, 47, 48, 49