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The Staff of SOH
When you say "flashback" it reminds me that there are 2 types of rotating beacons. There are civilian beacons, one white and one green. There are also military beacons, 2 flashes of white and one green. Essentially the white side is split so it appears as 2. It serves as a notice to aviators not to land at a military installation without an invitation!
I seem to remember learning one time that airport beacons would also have a different flash sequences that pilots could use as a navaid to tell different airports apart.
