Operate and monitor communications, detection, and weapons systems essential for controlling air, ground, and naval operations.

Operate and maintain catapults, arresting gear, and associated mechanical, hydraulic, and control systems involved primarily in aircraft carrier takeoff and landing operations.

Collect and dump refuse or recyclable materials from containers into trucks. They drive trucks.

Operate steam, gas, electric motor, or internal combustion engine driven compressors. They transmit, compress, or recover gases, such as butane, nitrogen, hydrogen, and natural gas.

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

Operate or watch over hoists or winches to lift and pull loads using power operated cable equipment.

Operate mechanical boom and cable or tower and cable equipment to lift and move materials, machines, or products in many directions.

Inspect aircraft, maintenance procedures, air navigational aids, air traffic controls, and communications equipment to ensure conformance with federal safety regulations.

Service automobiles, buses, trucks, boats, and other automotive or marine vehicles with fuel, lubricants, and accessories. They collect payment for services and supplies. They lubricate vehicle, change motor oil, install antifreeze, or replace lights or other accessories, such as windshield wiper blades or fan belts. They repair or replace tires.

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.