He registered for the WW II draft on 16 October 1940, and he was listed as employed by the Socony Vacuum Oil Co. He was 5' 8" tall; weighed 205 pounds; had brown hair, brown eyes and a 'dark' complexion. His service number does not appear in the NARA database. According to the VA BIRLS Death File, he entered the service on 24 January 1943 and was released from active duty on 16 September 1945.

We have Corporal Umphenour listed on the 437th TCG Special Orders #195, dated 27 December 1943, which contained 33 pages of names. These were the orders generated at Pope Field (Fort Bragg, NC) for the first phase of movement by air and by rail of the 437th personnel to their eventual overseas deployment. He is also listed on General Order #09, dated 31 March 1944, that authorized the award of the Good Conduct Medal to various 437th TCG personnel.