Construction mechanic (abbreviated as CM) is a United States Navy occupational rating. Construction mechanics perform tasks involved in maintenance, repair and overhaul of automotive, materials handling and construction equipment; assign and supervise activities of assistants who locate, analyze and correct malfunctions in equipment and issue repair parts; maintain records; prepare requisitions and reports; train assistants in repair procedures and techniques; maintain individual combat readiness and perform tasks required in combat and disaster preparedness or recovery operations.