Wind sock in picture #3
Used to tell wind direction for landing/take off
Other flag in #2 is US I think.
If it is a flag, not a windsock, it would be the same as the other? A US flag.
The flag I posted in >>990055 is taken from the location in the attached pic.
I recall an anon was going to do calculations for airconditioning to work out the volume of tunnels they have. I think this was after there was the big fire where they may have deleted evidence or been raided and destroyed after the recent 'earthquake'.