Donald Armstrong participant of World War I
Military career
On September 10, 1910, Armstrong was commissioned in the Coast Artillery Corps. During World War I, he was stationed in France. He participated during the Champagne and Meuse-Argonne offensives. In 1919, Armstrong was assistant military attaché to the United States Embassy in Paris.  In 1927, he graduated from the Army Industrial College.During World War II, Armstrong was promoted to brigadier general. From 1942 to 1944, he commanded the Tank Automotive Center and the Ordnance Replacement Training Center. From 1944 to 1946, Armstrong was commandant of the Army Industrial College. In October 1946, Armstrong retired from the Army. For his role in World War II, Armstrong was award with the Army Distinguished Service Medal and the Legion of Merit.