I was DZCO for practice jumps into Falcon stadium. I just called drop approved when the pilot told me to stand-by. I waited about a minute and transmitted again, got aonther stand-by. I'm thinking WTF, is he just BS'ing with some one on the radio. So again I transmit and this time he says we have to RTB ASAP. I'm a little agitated at this point. I get in the truck and head back to the squadron to find out what's going on. It didn't take long.
ATC was going crazy trying to get all aircraft on the ground as quickly as possible and they weren't fooling around. Got the tv turned on and saw the 2nd jet impacting.
A significant emotional event that I will never forget.