not sweets exactly, but some googd ideas here - love the camo baloons:
http://www.partypiece...xwGKA&cookie%5Ftest=1
You could just buy green/black sweets so that they look like camoflage sweeties!
My nephew had his birthday last week and my sister in law made him a sponge cake shaped like a tank. She managed to make the whole sponge different colours throughout so it looked like camoflage. It was great! I'm not sure how easy it was but if you are any good at that sort of thing could be a good idea that fits with your theme.
When my boys were younger, I made up some fabulous party bags by filling them with novelties from Hawkins Bazaar. They have shops all round the country. They sell bags of plastic soldier figures for £5, and if you go online to Party Works, they sell really good, strong, colourful bags to put everything into, as well as individual cake boxes, tablecloths and all sorts.
Hope it all goes well for you.