This correspondence course, originally developed for the Marine Corps, is designed to provide students who are acquainted with motor transport and tactical heavy vehicles with information on how to operate and perform preventive maintenance of those vehicles. The course contains five study units covering 2.5-ton M-Series tactical trucks, 5-ton and 10-ton M-Series tactical trucks, operating instructions for heavy tactical vehicles, preventive maintenance services, and M-Series tactical trailers. Each study unit begins with a general objective, which is a statement of what the student should learn from the study unit. The study units are divided into numbered work units, each presenting one or more specific objectives, and illustrated unit texts. At the end of the unit texts are study questions with answers. A review lesson completes the course. (KC)