Lewis University, southwest of Chicago, uses Bedcheck Charlie as their official mascot (thanks to Paul Lotakis for the tip), although they appear to get some of the historical facts wrong. From the Lewis University Website:
"In 1963, a cartoonist by the name of Milton Caniff illustrated a comic strip called Steve Canyon. This series was a follow-up to a previous strip called Terry and the Pirates, and followed the adventures of an Air Force pilot. Steve Canyon would investigate mysteries within the Air Force. One of Steve Canyon’s adventures took him to a flight school, at which he learned of the existence of Bedcheck Charlie. Charlie was a student at the school who dressed up in World War I flight gear and went around scaring the other cadets. It was unknown whether the cadet was a male or female, and the person was never caught.
"In the fall of ’63, some Lewis students were sitting in Sheil Hall one weekend discussing the need for a mascot. Steve Moskal, a freshman history major, and his proctor, Roger Mills, were discussing the fact that the students needed a symbol with which to identify. Moskal, having been a fan of Caniff’s work, remembered reading about Bedcheck Charlie in the Chicago Tribune. The two of them decided to write Caniff, asking him for permission to use Charlie as the school symbol. Caniff wrote back and gave permission to use Charlie."
Terry and the Pirates was originally created by Milt Caniff in 1934, but he relinquished the strip in 1946 after a dispute with his syndicate over creative control. Caniff then created Steve Canyon, while Terry and the Pirates was assigned to George Wunder, who continued it until 1973.
All the evidence seems to point to the fact that Bedcheck Charlie was created by George Wunder as a character in Terry and the Pirates, not by Milt Caniff in Steve Canyon, that the unnamed flight school was actually the U.S. Air Force Academy, that the perpetrators were two male cadets and a female friend, and that they were eventually caught and identified.