No, not actually Airborne but as Green Berets? We had to do many paradrops in Vietnam, Laos and Cambodia. We were a S.O.A.R. unit. It was actually very effective at that time as we could get in fast, run our mission and get out before the enemy could mass enough strength to get to us. WW2 Airborne troops were used a lot differently but very effective at creating diversions and taking vital bridges and crossroads.
I'm surprised that paratroopers were used in Vietnam. I always thought that to be a WWII tactic. What I'm mostly thinking about is the vulnerability of floating down to earth. One would think snipers could very easily target them.
They could in WW2 but our drops were very low altitude and in the very few clearings they could find. We also dropped in the jungle and had to rappel down out of the trees and brush.
In the Burns documentary one former paratrooper was telling a story of a mission where the drop was so low parachutes didn't have time to open and the men hitting the ground sounded like splattering pumpkins.
Is there an absolute minimum height? Anyway the Burns documentary is very interesting and very well done. It is also very depressing. The whole world seems to have gone insane in the 1940s!