Bob Callahan was part of the war that lasted through what years?
Bob Callahan (American football):  He played college football as a center for the University of Missouri in 1942, but his education was interrupted by two years in the United States Marine Corps during World War II. World War II: World War II (often abbreviated to WWII or WW2), also known as the Second World War, was a global war that lasted from 1939 to 1945, although related conflicts began earlier.
1939 to 1945