Colonel Charles R. Hamm was commissioned an Infantry Officer upon graduation from Officer Candidate School 6 September 1943, Class Number 290. His first duty assignment was as Rifle Platoon Leader, 83d Infantry Division, Camp Breckenridge, Kentucky. | His subsequent duty assignments include: Rifle Platoon Leader, 83d Infantry Division, England and France; ROTC Instructor, Missouri Military Academy; ROTC Instructor, Rockford, Illinois High School; Light Weapons Instructor, Kitzingen Training Center, Germany; Assistant G-3, 1st Infantry Division, Germany; Instructor, Staff Department, The Infantry School, Fort Benning, Georgia; Student, Medical Service Advanced Course; Instructor, Field Medical Service Dept, Field Medical Service School, Fort Sam Houston, Texas; Student, Command and General Staff College; Commander, 25th Medical Battalion, 25th Infantry Division, Hawaii; Assistant Chief, War Plans Section, Office of the Surgeon General, Washington, D.C.; Student, Armed Forces Staff College; Chief, Evaluation Division, Combat Developments Command, Medical Service Agency, Fort Sam Houston, Texas; Executive Officer, Office of the Surgeon, Headquarters, Eighth U.S. Army, Korea; Chief, Plans and Operations Division, Office of the Chief Surgeon,  Headquarters, U.S. Army, Pacific; Medical Coordinator, USA Readiness Region V, Fort Sheridan, IL; Staff Medical Advisor, Headquarters, Fifth U.S. Army, Fort Sam Houston, Texas. | Colonel Hamm's awards and decorations include: Combat Infantryman Badge, Purple Heart, Bronze Star, Legion Of Merit.