"[P]erhaps Superman’s most important war contribution was his direct connection to the troops. The scene of a soldier or sailor passing time with a comic book in hand was common overseas, and Superman was the superhero of choice for most of the servicemen and women. In fact, one of four magazines shipped to troops overseas was a comic book, and 35,000 copies of “Superman” alone went abroad each month. The U.S. War Department and USO made sure that copies of “Superman” magazine were distributed to soldiers, sailors, and marines throughout the war. Military leaders hoped to provide a little entertainment and escape until the troops could come back home for good. As “Time” reported, “Superman got a high priority rating last week: the Navy Department ruled that the Superman comic books should be included among essential supplies destined for the marine garrison at Midway Islands. For the tough Marines, as for all U.S. Armed Forces, the Man of Steel is still super-favorite reading.”"
January 1, 1970
https://en.wikiquote.org/wiki/Superman