The MQ-1 (Model Quartermaster 1) olive drab pile field cap is a modified version of the olive drab pile field cap. The pile lining of the original visor, which caused visual interference and forehead discomfort when the visor was lowered, was eliminated. The MQ-1 cap was adopted as the M-1951 pile field cap.
The M-1943 MQ-1 field jacket was a modified version of the M-1943 field jacket that contained inner buttons for attachment of a removable liner. The jacket was adopted as the M-1950 field jacket.