Ronald Reagan Enlists in the Army Enlisted Reserve
After completing fourteen home-study Army Extension Courses, Reagan enlisted in the Army Enlisted Reserve on April 29, 1937, as a private assigned to Troop B, 322nd Cavalry at Des Moines, Iowa. He was appointed Second Lieutenant in the Officers Reserve Corps of the Cavalry on May 25, 1937, and on June 18 was assigned to the 323rd Cavalry. His service number was 0 357 403.
U.S. Army Reserve History