Long ago when the RAF first started to go "green" the first Hi Vis feature was the cross of reflective tape applied to our bone domes. One of our number felt that this should be improved upon and wrote an L.G. Groves submission for "Toned Down Reflective Tape". He was however a little concerned when it became apparent that someone further up the food chain was taking it seriously!
I remember the night at Wyton when a crew bus nearly took out a crew on the ORP. Hi Vis vests might have made that less exciting! As was said above there is no doubt that wearing Hi Vis clothing on the ramp at a busy airport is a very wise move regardless of the element of compulsion. But with military operations there will come a time when it is definitely unwise to wear Hi Vis and if you are to operate safely in that environment then people must be fully aware of the problems and difficulties. To do that you must train for it and therin lies the problem, who is going to accept the risk?
Good luck and stay safe.
YS