I am not too bothered about finding military stuff either, but my last dig was coincidentally just off a WWII airfield, parked on the former runway in fact, only a few buttons and bullets, but then a 1st century Roman fibula popped out! Of course there will still be older finds there - the farmer probably had a quick wander about and got bored. Any live ammo dug is probably best just reburied, to save the hassle of proper authoritative procedure.
Oh! "Mr Bishop" and "Tinned meat" above
"I have no special talents. I am only passionately curious." - Albert Einstein