Just got session banned because some guy on my team decided he was going to run in front of my MG while I was shooting.
How do people think when they run in front of someone that is aiming his weapon?
In the real world, this is a possibility too. As I said above, real battles are bloody loud, and before long you will be deaf. Try turning off the sound and run around in a game without it. You'll see just how hard it can be to tell you're being shot at.
That is why this stuff only works properly if everyone knows the basics and sticks to them. There is so much more than what I said in my previous post. Arcs of fire should always be defined and adhered to. You never shoot outside your assigned arc, even if you see an enemy. This leads to less accidents because of target misidentification - if you're in my arc and I don't know who you are and why you are there, you are enemy.
Because you are only meant to cover one small arc, you can spend more time concentrating on the threats in your arc, and less trying to make sure there are none coming at you from other directions. Your squad mates should be covering their arcs too, so one of them will see that enemy and deal with it... you just make sure no one makes it through your arc and you are doing your job.
The real problem that we all have is that other people don't know what to do, so no matter what the game mode, it can feel like a death match where everyone is ganging up on you. You actually feel isolated and exposed, simply because you can't trust your own squad to cover your back, meaning you spend more time covering your own back and less covering your squad.
The gunner has a slightly different role though. You are less confined to an arc because you are actually capable of dominating a larger area than the other squad members, so your job will often be to cover "everywhere else", so to speak. That is why the gunner and the rest of the squad work as two halves of one unit. The gunner covers the others when they move, then they all cover him, when he moves.
The whole idea is that whoever is moving is not shooting. They are not looking for targets but for cover. They will run forward to the next safe cover and then use it to give covering fire for the next person to move. At that point you are in target acquisition mode. Your job is then to kill anything that moves, or at the very least make it stop moving. So if someone starts firing at the runners.. you open up and try to kill them or at least spoil their ability to take an aimed shot as much as possible. The combination of moving targets and incoming fire is usually enough to prevent them getting any kills. Remember though, it is better for your squad to arrive at the enemy position and find everyone dead, than to arrive and find them "suppressed". Once you are close enough, shaky hands don't matter. If the barrel is almost touching you, I could kill you with one hand and my eyes closed. Always shoot to kill, never to just "suppress".
The psychology here is key... the enemy will usually try to kill the guys who are in the open, because they seem to be easy targets. If they are moving they are hard to hit, even if you are not being shot at, so while the enemy tries to kill your squad mates as they run, you can take your time to find and kill them without being shot at yourself. It sort of sounds like using your squad as cannon-fodder, but it is their best interest too. If their movement gives you a chance to kill the enemy, then the next time they move there will be one less person shooting at them.
If someone is in a position to fire a shot at your squad, then you must also be in a position to fire a shot at them. Blasting away randomly is pointless. You want the gun ready and stable when he pops up to take the shot, not bouncing around from shooting at something else at random. You see movement you fire at it, if it moves again, you fire at it, always trying to hit the target. A lot of times your rounds will penetrate right through their cover and get the kill. So always take aimed shots at a target if possible.
Don't get target fixated though. I often intentionally expose my position to get the enemy to concentrate on me. If I know they can't actually kill me, then having them waste ammo on my cover, and not pay attention to anything else, can effectively take them out of the immediate battle. They aren't dead, but the aren't killing anything either, so they are neutralised, even if only for a short time. That might be all you need to let your squad outflank the enemy position and take him out.
There really is so much more. Whole manuals are written on small unit tactics, and the infantryman's role is really just as specialised as the pilot or the tanker. You can't just pick up a gun and run off into battle and expect to survive for very long. Even if you do everything right, you will die... a lot. The idea is to make the other bastard die more.
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By the way, I believe a whole lot of the TK's in this and other games come from the fact people don't cover their own arcs and nothing else, and because they don't think about the arcs other people are covering. They will see a target in front of them and run to the side, trying to get a flanking position, only to pop up in front of one of their own team members in the same place the enemy is coming from. Reactions are key, the first to shoot usually wins, so that guy who is the wrong place, is likely going to get a bullet in the back. It's not the fault of the shooter, but of the runner for being in the wrong place.
There is usually more than one reason for doing something a certain way. Covering arcs and using coordinated movement is about being able to maintain a steady rate of fire on the enemy while being able to advance AND about reducing the opportunities for friendly fire accidents. Every time I spawn I always see the same thing - everyone takes off at full sprint trying to get back to the battle, but they no longer have good info on what is going on, and the front line will have moved, and often they end up running into an ambush. Sometimes it's their own team's ambush, and they end up being TK'd, because they ran into the killing ground when no one was expecting any friendly to be there.