Why do people on video wear non-military boots, yellow identification stripes, use outdated weapons and can't hold a gun right? I mean with left hand, there are

Why do people on video wear non-military boots, yellow identification stripes, use outdated weapons and can't hold a gun right? I mean with left hand, there are no left-handed versions, especially so old, used rounds will hit user's face. And that "sniper" actually doesn't shoot at all. And leaves only _after_ everybody moved back, leaving him exposed. That's ridiculous.