Airport Rotating Beacon

A visual NAVAID operated at many airports. At civil airports, alternating white and green flashes indicate the location of the airport. At military airports, the beacons flash alternately white and green, but are differentiated from civil beacons by dualpeaked (two quick) white flashes between the green flashes.

Source: Pilot Contoller Glossary (PCG)

See also:

Reference:

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