This report is Phase 1 of a two-phase research project to study the extent of use of nontherapeutic drugs in the Armed Services, and to identify demographic correlates of drug abuse. A stratified sample of 36,510 enlisted men, representive of the four Armed Services on a worldwide basis, responded to a 73-item Survey of Drug Use. Reported use of drugs in the period Sep 70-Sep 71 was highest for men in the Army. Army personnel also reported the highest daily drug usage rates. Except for the Army, daily usage rates for drugs were less than 2%. Major correlates of daily narcotic use included age, rank, race, and military service. Nontherapeutic drug use is predominantly reported by younger enlisted men, in the lower pay grades. Higher rates of drug use are reported by non-whites. Use of drugs as a civilian is positively related to drug use in the Service. The report also contains findings on drug acquisition, availability, sources, of supply, and recognition of drug problems by admitted users of nontherapeutic drugs. (Author)