Frank entered the Army on March 18th, 1944 at Ft. Bragg, North Carolina. His stint in the military was short. He was Honorably Discharged on December 30th, 1945. As part of his initial training, he was sent to Wyoming to "tank school". His exact work regarding tanks isn't specified on his paperwork, however, I believe he may have been studying them to learn their mechanics. At the moment, though, that's speculation.
During his brief time in the Army he was stationed in the Phillippines.