Ok, I'll try the military - thanks:) I had avoided it before, because I seem to remember reading that they'd get confused about their picks. But maybe that's only if I activate them, or assign weapons.
Actually, the issue is that miners (and woodcutters, and hunters) have a "civillian" outfit--a pick (or an axe, or a crossbow/bow/whatever), to be exact--that cannot be "worn" with a military uniform. So, while Urist McMiner is naked as the day she was born, her children will be clothed. Weird, huh? Well, this is DF.
As I understand it there is a hidden miner/woodcutter/hunter uniform that only has the corresponding weapon assigned pick/axe/ranged
You could designate a "wrestler" uniform (an uniform without any weapon) assign it to them and even draft miners/woodcutters/hunters and they'll use the weapon they already carry without the bug of hauling their current weapon and try to pick another one (even if is the same kind of weapon) that occurs when you assign them an uniform that uses a weapon (even if it's the same weapon they already carry)
Ironically you can create an uniform with weapon "pick" and it's a "Miner" squad, even though they don't have the miner labour active
not sure if non miners (labour) training with picks will gain mining experience though... they sure use the mining skill when fighting with a pick, so your legendary miners in a "wrestler / no weapon" squad are lethal and can be drafted conveniently when they are walking close by....
training woodcutters as axedwarves is a little trickier, you'll have to use a "wrestler" uniform when they have woodcutting labour enabled, and use an axedwarf uniform with the labour disabled, the same with hunters / marksdwarves / bowdwarves / blowgunners