The United States Army Medical Service Corps

Zone of the Interior Hospital Positions Opened to Medical Administrative Corps Officers in 1941

Hospital Size (in Beds)	Adjutant	MSO	Enlisted Detachment Commander	Mess Officer	Asst. Registrar*	Asst. Adjutant	Asst. MSO	Asst. Enlisted Detachment Commander	Asst. Mess Officer
50, 75		2LT
100, 150, 200	1LT	2LT	1LT
250, 300, 350, 400	1LT	1LT	1LT	CPT
450	1LT	1LT	1LT	CPT
500, 600, 700	CPT	CPT	CPT	CPT		2LT			2LT
750, 800, 900	CPT	CPT	CPT	CPT		2LT	1LT	2LT
1,000	CPT	CPT	CPT	**		2LT		1LT	2LT
1,500, 2,000	CPT	CPT	CPT	**	1LT	2LT	2LT	1LT	1LT

*The registrar was required to be a Medical Corps officer.|
**The mess officer was required to be a Medical corps major in hospitals of 1,000 beds or greater.

Source: Clarence M. Smith, The Medical Department: Hospitalization and Evacuation, Zone of Interior, volume in series United States Army in World War II (Washington, D.C.: Office of the Chief of Military History, Department of the Army, 1956), p. 132.