Here the ground crew will refuel, equip and prepare the helicopter/plane for flight, hand it over to the commander and flight engineer, and after it is their job. On large copters, in addition to the flight engineer, there is a flight operator who controls the loading, cargo on board, or manages the cargo on an external sling.Crew Chief/SMO/'Loady' roles:
Pre-flight, draw weapons and ammo. Prepare/secure internal and external loads. Brief passengers. Assist with spatial awareness during taxi and flight. Scan arcs for threats. Engage threats as required.
Pass forward juice boxes for pilots.
Harrass Ground Crew...
In my crew on a cargo plane, these functions are also performed by a flight operator, there is built-in equipment for loading and unloading.
But here "crew chief"sitting on the ground with his ground team and waiting when crew return to continue servicing the aircraft after landing.