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Ya, truck mirrors work fine. Should be easy on a Humvee but on a Bison ambulance or similar armoured ambulance may be a little inconvenient. You'd have to go a long way to break a stainless mirror.
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For your field kit DE you might want to try a travel DE like this Merkur Travel Razor Merkur at werd.com . Others make them too. A stainless steel pocket mirror works well too for shaving with...

Joking around about such a contest is one thing but seriously entertaining running it is something else again. Personally, something far less than a good idea.

Bob

Ah, NO.

Bob