[2] His brother, Ernest A. Giroux, was a First Lieutenant in the United States Army Air Service who was killed in action on May 22, 1918.
[7] In 1943, Giroux was commissioned a captain in the military government branch of the United States Army Provost Marshal General's office.
He was assigned as an American military government officer with the British infantry in Normandy until the Allies entered Germany.
He then served as commander of a British military government unit that was part of a joint British-American operation.
He returned to the United States Army as the commanding officer of a military government detachment in Hof, Bavaria.
[2] On March 14, 1946, Giroux was elected chairman of the Massachusetts Republican State Committee.
[11] Giroux served as vice president and general manager of Haley-Cate Co. from 1947 until his death on October 15, 1968.