According to the Air Force definition, this is a Wingman:

“The term Wingman stems from a time-honored tradition within our Air Force flying community that essentially says a lead pilot will never lose his/her Wingman. It’s a promise, a pledge, a commitment between Airmen who fly. The Air Force wants to cultivate and instill this same culture of commitment between all Airmen and Air Force civilians in all career fields and specialties via the Wingman program.”