Green served from 1943 to 1946, rising to the rank of Sergeant. He returned to Philadelphia in March 1946, intending to use the benefits of the G.I. Bill to attend Drexel University. He planned to major in electrical engineering, which was the field he had worked in during his time in the Army. Drexel did not have classes starting until September, so Green began to look to work. While seeking employment at Temple University Green learned that Temple had classes beginning in two weeks, so he decided to enroll there.