When I married a cop my bouquet had bullets and handcuff keys spray-painted gold and wired into it. Maybe shot-gun shells, etc. wired into any floral arrangements?
The centerpiece could be something consisting of a group of things used during camping and then the birthday guy would be given the centerpiece after the party ends.
Camo blanket as a tablecloth and a basket full of fun/necessary stuff used for camping/hunting. Going to a large sporting goods store can give you lots of ideas.
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