From the 1,000 staff that remained

From the 1,000 staff that remained after FIS was transferred to OWI in June 1942, the OSS expanded to a peak of over 13,000 personnel by late 1944, and at least 24,000 people worked for the OSS at one time or another during its brief existence. Members from all the military branches served in the OSS, and it provided the USMC its few opportunities to engage in operations against the Germans. Civilian staff worked as clerks, analysts, scientists, engineers, and even behind enemy lines. About 4,000 women worked for the OSS either as civilians or in uniform, performing clerical roles and helping prepare missions in operational theaters, and some - such as Virginia Hall, and locally recruited agents like Helene Deschamps - operated behind enemy lines. The OSS was organized into the following branches.