Final answer:
A rotating beacon that flashes green, white, white at night signifies a civilian land airport. This beacon pattern aids pilots in identifying the type of airfield during night operations.
Step-by-step explanation:
If the airfield you intended to land at during night operations has a rotating beacon that flashes green, white, white, it is indicative of a civilian land airport. According to aviation standards, civilian land airports have a rotating beacon that operates from sunset to sunrise. If the rotating beacon flashes green and white, it's a clear indication of a civilian land airport. However, other types of beacons include green, yellow, and white for a seaplane base, while military airports usually have two quick white flashes followed by a green flash.