Basic Responsibilities of a Fireteam Member

(The following is as quoted from ShackTac)
In order to play at the highest possible level of coordination, teamwork, and effectiveness, there are many things that each player must be familiar with. This entire manual is an example of that, of course. The key foundational aspects of this are in the 'basic responsibilities' of each fireteam member, and by association, every player in our group. In order to maintain cohesion and combat effectiveness, every player in our community is expected to abide by these simple ground rules.

As a fireteam member, you must...
Know your squad and fireteam. With our structure, squads are lettered and fireteams numbered. Remember what team and squad you are in, as this allows you to pick out, confirm, and act upon voice orders relevant to you. Make sure you are familiar with your fireteam leader's voice, as well as that of your buddy team member.
Listen to your team leader and follow their directions. Fireteam and Squad Leaders are typically the more experienced players. Their role is to try to keep you alive and in the fight, while accomplishing whatever mission the squad may be tasked with. Listen to them and stick with your team.
Practice fire discipline and know the Rules Of Engagement. Do not be the one to give away a stealthy approach by accidentally firing your rifle or firing at a target without having been given clearance. Once things heat up, and the element of surprise is lost, you're usually free to shoot at anything that poses a threat. Until then, maintain good fire discipline, in accordance with the instructions of your element leader.
Maintain appropriate interval. Bunching up gets people killed. Keep several meters of interval between yourself and other players at all times. If not, a grenade, rocket, or machinegun is going to have a fun time with you and those you have clustered with.