Just as normal people do - have a hot drink and man through it! If it was a proper bout of 'flu - which is perhaps the most overreported disease in human history - in the field, you could probably expect to be CasEvac'd to the rear and off the exercise, to the ridicule and abuse of your colleagues.
The British take the view that large-scale drops are very vulnerable - witness the huge casualty rates during Market Garden from men who hadn't even reached the ground, not to mention the chaos that followed - and so should be avoided against an enemy with credible air defence or even strong ground forces. I understand that the Americans and the Russians feel differently about it.
My Brigade (173rd Airborne Brigade) and I parachuted into Iraq, 26 March 2003... it is completely sound, because it makes the enemy defend in depth. Meaning, he can't just pile on a front line. I would agree that the UK mustering enough air frames for a brigade may be... a bridge too far.
The British take the view that large-scale drops are very vulnerable - witness the huge casualty rates during Market Garden from men who hadn't even reached the ground, not to mention the chaos that followed - and so should be avoided against an enemy with credible air defence or even strong ground forces. I understand that the Americans and the Russians feel differently about it.