The Norwegian army just replaced it's good old AG3's ( http://en.wikipedia.org/wiki/AG3 ) with HK416's. I'd have to say that my favourite military weapons would have to be the K98 or the AG3. Any fully automatic weapon that fires 7.62x51mm NATO rounds has my undying respect. I've talked to a few friends who have served in the army abroad, and they all refer to it as the Norwegian hand-cannon. Which is rather fitting, I think.
Edit: When in the army, the officer in charge of our weapons training told us that when firing at enemies taking cover behind trees, the idea was to shoot the trees, because the bullets could easily kill someone hiding on the other side.