Becouse a lot of the monsters are not effected by bullets and even the Sunnydale PD would have notice automatic gunfire every night and the slayer is even more vulnerable to bullets than the enemy so best not to point that out by using guns first.
Being good at a sport in the British army means that you basic ly train and compete in your sport. 17 British Sports Stars You Didn't Know Served In The Military I know that one year our battalion ski team spent all winter sking in baveria