Thank you everyone for your suggestions. My head is spinning! I'm lucky in that I have hired an entertainer for DS2 for the first time, so she will do the party games, however the decorations, party food and party bags are all down to me.
DS2 does not want an army cake, even though it's an army theme. He says he wants a Minecraft cake
(it's an online game that he's watched his big brother play). I asked if he wanted a model of a Minecraft creature on top, but he said no, just a picture. That should be fairly easy as I think there are cake toppers available. I know all the other DC (and parents) will be baffled by the cake, but at least DS2 will be happy
. I love the mess food suggestions, but I'm planning to go the easy route and fill camouflage party boxes with food.
TheDoctorsWife - yes, maybe mentioning princesses is going too far. I'll just put 'civilians welcome too'.
Stealth and Blathers - that's really kind of you both to offer camouflage nets. I'm in Sussex.
And what is it about boys and army stuff? Neither of mine were in any way encouraged to play fighting games yet they both love anything to do with warfare (in fact I refused to let DS1 have toy guns for some years, but he just made guns out of Lego instead. I can't believe I am now letting his little brother have an army party. I have been worn down!).