Crewman (noun)

1. A member of a ship's crew.
2. A member of a crew of a vehicle, especially an aircraft or spacecraft, who performs a specific function or task.

Origin:

Early 20th century: from crew + -man.

Examples:

1. The crewman manned the ship's wheel.
2. The crewman prepared the ship for launch.
3. The crewman checked the engines of the aircraft.
4. The crewman helped load the cargo onto the ship.
5. The crewman communicated with the air traffic control.