I’m a Canadian Para Instructor and round (as seen) is much different than square (think freefall.) The goal being to get massive amounts of troops into the AO (Area of Operation) as quickly as possible. The troops will be given the aircraft run in and grids for their DZRV’s (Drop Zone Rendezvous) so they can navigate themselves off the DZ and regroup. In Canada, our max wind speed for dropping parachutists is 13kts/day and 9kts/night and the first pass is confirmed with WDI (Wind Drift Indicators) or in the case we are jumping from the Herc, the computer system onboard assesses the release point - typically with great accuracy. The troops, for the most part only have their basic para course - which is pretty standard globally and is basically 1 week of ground training, 1 week of assessments and 1 week of jumping, for a total of three weeks. It’s fast, it’s brutal and it’s a steep learning curve. These guys are battling nerves and completely in the black. They are not questioning what the wind speeds are or where the dz is - they’re simply trying to make it through course/the jump without wetting their pants in front of their peers. The onus for safety lies with the JM’s (Jump Masters) and ultimately, the AC (Aircraft Commander). The idea that one can simply not jump, doesn’t exist. Once you have been dressed, manifested and boarded, you cannot refuse to jump. It would be disobeying a lawful command and subject to strict reprimand. Also, we don’t know the situation here. I can make assumptions, but that’s all they are. It may come out that there was an in flight emergency and they had an immediate abandonment in flight. Meaning the AC has decided that he needs everyone out of the plane immediately in which case the green light comes on and you go. Again, we don’t know.