Someone in Taiwan captured the USAF C-17 with Taiwan’s Oerlikon GDF-006 35mm towed anti-aircraft gun in the same video frame during the former’s visit to SongShan airport on Jun. 5.
The Oerlikon GDF-006 35mm twin-gun is routinely deployed to the airport which is also an air base for the military. The red flag on the left side of the gun indicates live rounds.