John G. Tevis was born on January 15, 1925 in Phoenixville, Pennsylvania. John was one of nine children.
John attended two years at Phoenixville High School. He was a member of the Sacred Heart Church.
John entered service in the Army in June, 1943. He trained in Texas and Louisiana. He returned home on an 11-day furlough for the Christmas Holidays in 1943. He said, “Army life is swell, but home life is still better".
John was sent overseas to the Pacific Theater of Operations in June, 1944 assigned to the 287th Field Artillery Observation Battalion. The Field Artillery Observation battalions did not have artillery, but were trained to set up observation posts, and communications, for counter battery operations – countering enemy artillery. This was done by sound and flash ranging (observe source of enemy artillery by sound and their flashes), to call in fire support and adjustments for accuracy.