[U49]

It's called "training accident" and as far as nobody gets's injured you can laugh about it. (or get angry about the waste of tax money by stupid trigger-happy morons)
One more ?
During my army service (back in the cold war) our artillery battalion used to fire from positions south of the garrison town to the target area in the north.... so far everthing is fine..
One day someone miscalculated the distance or the powder charge by exactly 1/2 and a 155mm flattened the garden shed of the lokal bank CEO. Luckily it was only a training round that day. (no explosives, just the shape and mass to get ballistics right)
Two things to remember:
a) nobody injured, just killed some garden dwarfs
b) but the crater was a *PERFECT* hit.

You are wondering how this can happen ??