Milton enlisted in the Army enlisted reserves while attending the Pennsylvania Military College. He was called to active duty in July 1943. After completing training he was sent to England in January 1944 and assigned to Headquarters 1st Battalion 116th Infantry where he was to serve as ammunition handler, intelligence observer and scout. He trained with the unit and was with the unit for the D-Day landings on 6 Jun 1944 on the coast of Normandy. On 30 Jun 1944 he suffered shrapnel in his left arm but remained on duty. Promoted to PFC on 22 Jul l944, he was wounded on 7 Aug 1944 and evacuated to hospital. PFC Matteson returned to the unit from the replacement depot on 5 Nov 1944. He was serving as a scout when he was killed in action on 21 Nov 1944.
PFC Matteson was repatriated and re-interred in Arlington National Cemetery in Arlington, Virginia.
Milton's father served in WWI. Milton has no known relationship to PVT Earl G. Matteson who served in the same unit at the same time.