Hi Huy,
great show!!
don't worry too much about the flag! Gino is right because he quoted the general rule....and BTW that last pic is from an exercise, at least partly in built-up area, so!?!
The whole flag idea is a tad contradictory anyway! It should be seen (otherwise it makes no sense at all)...and it should not be seen (camouflage)....possibly at the same time!?!?
Cheers
Romain