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mobile army surgical hospital
From The Collaborative International Dictionary of English v.0.48:
MASH \MASH\, MASH \M*A*S*H\, n. (Mil.) An abbreviation for Mobile Army Surgical Hospital, consisting of the equipment and personnel required to perform emergency operations on injured soldiers, located in tents near the front lines of combat; as, he worked in the 25th MASH. [PJC]