As a joint endeavor by the Departments of Defense, Transportation, and Health, Education, and Welfare to demonstrate military resources and techniques which are utilized in combat, the Military Assistance to Safety and Traffic (MAST) program was pilot-tested in 1970 at five military bases. Undertaken to explore the feasibility of utilizing military helicopters and military paramedical personnel in responding to civilian medical emergencies, particularly highway accidents, MAST was essentially an operational test where military resources of known capability were meshed with local Emergency Medical Service systems, without the provision of additional resources and without administrative difficulties. Program effectiveness and community acceptance varied for each site. Numerous photographs illustrate the text, which includes extensive recommendations and conclusions. The following topics are focused upon: (1) a medical evaluation of the program, (2) background and actual experiences of the program, (3) the civilian viewpoint, (4) military aspects, (5) helicopter considerations, (6) cost considerations, (7) legal aspects, and (8) future activity. (Author/AG)