Final answer:
The brevity code word for a refueling track flown by a tanker in military aviation is 'Arco'. It represents the orbit pattern for the tanker aircraft during aerial refueling operations.
Step-by-step explanation:
In military aviation terminology, particularly in the context of air-to-air refueling, the brevity code word for a refueling track flown by a tanker aircraft is “Arco.”
This term is used by both the tanker and the receiver during their communication to designate a specific orbit pattern in which the tanker aircraft flies while waiting for receivers to join up for refueling. It is essential for the efficient operation and coordination in complex aerial refueling operations.