noun
radius of action; combat radius
Military term for the maximum distance a vehicle or unit can operate from its base and return without refueling.
この戦闘機の行動半径は約800キロだ。
This fighter's combat radius is about 800 kilometers.
noun
sphere of activity; range of activity
Extended figurative use for the area or scope within which a person or organization operates.
彼の行動半径は都内に限られている。
His sphere of activity is limited to central Tokyo.