Construction mechanic (abbreviated as CM) is a

United States Navy The United States Navy (USN) is the maritime service branch of the United States Armed Forces and one of the eight uniformed services of the United States. It is the largest and most powerful navy in the world, with the estimated tonnage ...

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. At the master chief petty officer level, they merge with all other construction ratings as a master chief seabee (abbreviated as CBCM).

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