The history of the first women to serve in the Marine Corps is a fascinating record of the dedication and drive of American women during World War I. The purpose of this monograph is to tell the story of the small band of women who answered the Corps' call for volunteers in 1918 with patriotism and enthusiasm. A former Director of Women Marines, Colonel Jeanette I. Sustad, USHC (Ret.) originated the project of compiling data for a history of women Marines who served in World War I. In 1971, she asked various members of the Women Marines Association to interview surviving veterans throughout the country. A questionnaire designed to guide the interviewers as well as background information on the service of women Marines in the 1918-1919 period was developed by Lieutenant Colonel Pat Meid, USMCR. Lieutenant Colonel Meid, who authored the official history, Marine Corps Women's Reserve in World War II, originally published in 1964, accumulated considerable material on the earlier group of women Marines during her research. This was all made available to the author of this monograph. The interviews conducted during 1971-1972, 29 in number, form a valuable archive of personal experiences of these pioneer women Marines. They have been used to supplement the official records which are sparse and elusive. Muster rolls of the time were checked exhaustively in compiling a roster of women who served, but it proved impossible to discover all the names making up the 305 women who were enlisted as Marine .Corps Reserve (F). Much information was gleaned from contemporary magazine and newspaper articles, particularly from Leatherneck, Marine Corps Gazette, The Marine Magazine, Recruiter's Bulletin, and the New York and Washington daily newspapers. A small but useful collection of Women Marine memorabilia, including photographs, letters, and clippings, was donated by various individuals as a result of publicity about the project.