I'm the guy who you need to see but won't until it's too late for you, your friend, or possibly your neighbor if I'm in the mood for a good ol' wheeze.
I sneak around with explosives, and when you least expect it, BOOM! There goes your support vehicle, and when you go with your assault rifle to follow the smoke trail. By now of course I'm already gone, having reloaded on the way out, then, whilst hiding, BOOM! and you're gone too.
The funniest thing is when the enemy starts expecting me to flank them, though, because by the time they've set up their defenses I just charge, machine gun blazing and kill as many of them as I can. This naturally sets them off balance, and that isn't helped by my tendency to jump out of aircraft just so I can get to a higher place to shoot them all. They see it explode, and then BOOM! so do they.