Any advice on how to go about this would be much appreciated.
Don't do it.
Technically carrying personal weapons is not against regulations, at least Army regs, nor is it against the Geneva convention... you'll hear both and it's not true (unless they've changed the regs in the past few years).
What it does violate is the theater commander's orders. All theaters have standing orders that troops will not deploy into theater with personal weapons. You'll see it on your unit mob order.
There may be additional orders preventing it as well. At best you'll lose the weapon. At worst you'll lose some stripes or even your freedom.