Researching Oscar Koch

A native of Milwaukee, Wisconsin, Koch was raised and educated in Milwaukee and joined the Wisconsin National Guard as a private in 1915. He served in the Pancho Villa Expedition in 1916, and rose through the ranks to become corporal, sergeant, and regimental sergeant major. When his unit was federalized for World War I as part of the 32nd Division, Koch served in France and received his commission as a second lieutenant of Field Artillery. He then served as an instructor at the Army's wartime artillery school in Saumur.

After the war, Koch returned to Milwaukee, where he was one of the re-organizers of his old Wisconsin National Guard unit, which he commanded as a captain. He obtained a Regular Army commission as a second lieutenant of Cavalry in 1920, was quickly promoted to first lieutenant, and was appointed to command a troop of the 8th Cavalry Regiment. Koch slowly advanced through the ranks in the 1920s and 1930s, and developed a positive reputation as an instructor and academic, primarily as a member of the faculty at the Army's Cavalry School at Fort Riley, Kansas.

During World War II, Koch joined the staff of George S. Patton's 2nd Armored Division as Intelligence officer (G-2). Koch served under Patton in North Africa and Europe as Patton successively commanded I Armored Corps, II Corps, Seventh Army, and Third Army. During the war, Koch developed procedures and policies for gathering and analyzing intelligence and providing recommendations to commanders, many of which continued to be used after the war.

Following the war, Koch served as deputy commandant and commandant of the Army's first Intelligence school, and as director of intelligence for the Allied occupation of Austria. He was promoted to brigadier general in 1954, and served in the Korean War as assistant division commander and acting commander of the 25th Infantry Division. He retired in September 1954. After retiring, Koch resided in his wife's hometown of Carbondale, Illinois, where he was active in several civic and fraternal organizations. He also authored a brief memoir of his World War II service, which continues to be used as a guide for Military Intelligence professionals. Koch died in Marion, Illinois and was buried at Arlington National Cemetery.