Out of 33 coffins with names on them, only one belongs to a real military dwarf. She was Legendary +5 in Wrestling, Shield Use, and Hammers and pretty dang high up in Armor Use, too. She was in steel full plate of exceptional and masterful quality and she was wielding a masterful steel hammer. She and four or five others of similar skill and equipment were engaging eight or so goblins.
One of the goblins got lucky or she got unlucky. Just goes to show you never can tell.
No deaths due to training accidents as my military dwarves trained up without weapons until Grand Master Wrestling at least, and were put in steel full plate of exceptional and masterful quality being given their silver training hammers.
Since the hammer squads are now wielding their masterful steel hammers and the thirteen Royal Guard often start with no skills (but full sets of exceptional and masterful steel plate), I'm rather surprised none of the guard have taken a fatal hit, yet.
No deaths due to cave-ins. After countless accidents in the past I've finally learned to be mindful of this sort of thing, so far. No promises.
I'm not counting the civilian-caught-in-an-ambush-turned-fresh-recruit as military, though. They're just civvies who were told to fight back.
Kobolds, though, have died more than anything else. All of my dwarves have very high stats. So if a kobold is spotted and a civilian is recruited that recruit can and will catch and kill that kobold.
Still, I am missing an artifact ring. It ended up outside and a year or two later it was gone. Shouldn't I be seeing kobold ambushes at some point?