Hong Kong, late 80's. Flying a Scout (doors off as usual), with Gurkhas abseiling on a FIBUA (Fighting In Built Up Area) exercise.
Four of them jumped off, two at a time each side as planned. I flew away and as I turned I saw them all lying on the ground motionless.
I then got a call to return, pick them up and take them to hospital as they were all injured, having forgotten to tie off before jumping !!
Elite fighting force