Perform in-flight duties to ensure the successful completion of combat, reconnaissance, transport, and search and rescue missions.

Load and unload chemicals and bulk solids, such as coal, sand, and grain into or from tank cars, trucks, or ships using material moving equipment. They perform a variety of other tasks relating to shipment of products. They gauge or sample shipping tanks and test them for leaks.

Tend, control, or operate power driven, stationary, or portable pumps and manifold systems to transfer gases, oil, other liquids, slurries, or powdered materials to and from various vessels and processes.

Pack or wrap by hand a wide variety of products and materials.

Feed materials into or remove materials from machines or equipment that is automatic or watched over by other workers.

Operate or watch over machinery equipped with scoops, shovels, or buckets, to excavate and load loose materials.

Control or watch over conveyors or conveyor systems that move materials or products to and from stockpiles, processing stations, departments, or vehicles. They control speed and routing of materials or products.

Operate and watch over bridges, canal locks, and lighthouses to permit marine passage on inland waterways, near shores, and at danger points in waterway passages. They supervise such operations. Includes drawbridge operators, lock operators, and slip bridge operators.

Operate small motor driven boats. They assist in navigational activities.

Supervise or coordinate activities of crew aboard ships, boats, barges, or dredges.