Heli out to the rigs?
Are you operating from the RZ requiring security screning or from the hangar?
hangar - carry what you like, just don't show the wrong person.
RZ - tools of the trade are allowed. No points greater than 3cm. Leatherman - no chance. GPS is ok. Security may want to see it switched on.
I sometimes carry a radio in a plastic bag - just in case.
That must be some pocket money to get better NVG's.
If you want to cut straps, I wouldn't use a leatherman. You will never get the thing open in the cold and if you do you may stab yourself.
Get a special divers knife with a chisel end.
