I'm not in the military. I have three kids and only a tiny bit of income for this hobby.
I got my money from selling stuff that I didn't need, building stuff custom from junk, and returning cans and bottles. Seriously.
Eventually I got enough cash from that to buy parts plus some extra, selling those extra parts to help pay for the parts I wanted to keep.
I also kept my eyes out for free arcade swag. My first cab cost me a whopping $0. Yes, $0. Computer I found on the street, old cab that was being tossed, old parts.
Eventually I had enough cash to build a couple decent cabs from actual cabs, an old Galaxian that was gutted and a POS Dynamo.
My point is this: it is quite possible to do a lot with very little. Begging for money to fund your hobby is demeaning. If you were asking for food or whatever, that would be one thing. Of course it's not illegal, but it doesn't paint you in a very favorable light.