History of the U.S. Army Medical Service Corps:
The story of the U.S. Army Medical Service Corps is evolutionary. Precursors such as Revolutionary War apothecaries and officers of the Civil War Ambulance Corps evolved into the World War I Sanitary Corps which was established on June 30, 1917, as a temporary part of the Medical Department based on authority provided by an 18 May 1917 Act of Congress. This corps, which rapidly expanded to nearly 3,000 officers during the War, enabled the relief of physicians from a variety of administrative, technical and scientific duties. The Sanitary Corps was demobilized following the war.
During the inter-war years, it became clear that the Army needed a permanent medical ancillary organization. This led to the establishment of the Medical Administrative Corps (MAC) on 4 June 1920. Growth in WW II was spectacular. The MAC increased from less than 100 officers in 1939 to over 22,000 by 1945. These officers freed physicians for patient care responsibilities by occupying an expanded variety of positions. These positions included replacement of the second physician in maneuver battalions.
A third precursor, the Pharmacy Corps, was established as a Regular Army branch on 12 July 1943. Finally on 4 August 1947, the Sanitary, Administrative and Pharmacy Corps were replaced by the Medical Service Corps consisting of four sections: Pharmacy, Supply and Administration, Medical Allied Sciences, Sanitary Engineering, and Optometry.
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