To request military service records of your veteran now click here: Request a WWI Marine Corps military service record What is the WWI U.S.M.C. service record? The WWI U.S.M.C. service record (also referred to as the Official Military Personnel File or O.M.P.F.) is a vital tool for researching individual Marine Corps veterans of WWI. During the Great War the service record, which was essentially an administrative collection of records pertaining to the individual veteran, was transferred everywhere the veteran went- from basic training to discharge. The WWI U.S.M.C service record was constantly being...