The ASU was originally formed in 1977 as the Special Action Squad on standby for security at Kai Tak Airport.

[1] In 1998, the ASU moved to the Chek Lap Kok Airport.

ASU officers can be identified by their distinctive deep blue uniform and are armed with sub machine guns as well as semi-automatic pistols.

[5] The ASU has a training range for firing simunition with corridors, rooms and check-in counters to simulate the airport terminal and also a mock-up of an aircraft interior to simulate a plane.

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