Final answer:
The brevity term for sighting a FRIENDLY aircraft or ground position is "friendlies."
Step-by-step explanation:
The brevity term for sighting a FRIENDLY aircraft or ground position is "friendlies." During combat, it is crucial for military personnel to be able to identify their own forces to prevent accidental attacks. By referring to friendly aircraft or ground positions as "friendlies," it helps convey to others that these are not enemy targets.