Answer:
Wingman
Step-by-step explanation:
Air crew members in military aviation are the people who operate the plane and perform several in-flight duties such as proper working of equipment's, monitor engine and other control systems, rescue and search missions.
There are many members of an air crew in military aviation such as pilot, air gunner, Flight engineer, navigator, air observer, signaller, flight officer, and bombardier.
A wingman is not a member of an air crew as wingman is a person who fly plane in an aircraft formation only and do not perform about function.
Hence, the correct answer is "Wingman".