US Navy

Damage Controlmen (DC) perform organizational and intermediate level maintenance and repair of damage control equipment and systems; plan, supervise, and perform tasks necessary for damage control, ship stability, preservation of watertight integrity, fire fighting, and chemical, biological and radiological (CBR) warfare defense; instruct and coordinate damage control parties; instruct personnel in the techniques of damage control and CBR defense; supervise and perform tasks in procurement and issuance of supplies and repair parts; prepare records and reports.

Hull Maintenance Technicians (HT) plan, supervise, and perform tasks necessary for fabrication, installation and repair of all types of shipboard structures, plumbing, and piping systems; organize, supervise, and train personnel in maintenance and hull repair; supervise and perform tasks in procurement and issuance of supplies and repair parts; instruct personnel and enforce safety and security precautions; prepare records and reports.

Machinery Repairmen (MR) perform organizational and intermediate maintenance on assigned equipment and in support of other ships, requiring the skillful use of lathes, milling machines, boring mills, grinders, power hack saws, drill presses, and other  machine tools; portable machinery; hand tools; and measuring instruments found in a machine shop.