
2. TALK TO YOUR TEAMMATES. When the firing starts, all surprise is lost and coordination becomes more important. Tell your mates what you intend to do (and what you want them to do) so they won't waste time having to ask you. Don't leave them in the dark about what you can see.
3. TAKE ADVANTAGE! When you spot an opportunity, get ready to go full blast for it. Quick reflexes based on situational awareness gives you a massive momentary advantage (SURPRISE!). Knowing the right timing (when to do what) is an invaluable skill. Also, be ready to create an advantage (distractions, bluff, speed, etc.).
4. MOVE AROUND. Do it either silently or quickly because in-between won't work-- slow AND noisy kills. Work with available cover if you can, but RUN FAST as much as possible if you really have to move. At full speed you can cover 5 meters (15 feet) in as little as 2 seconds, just be sure to STOP as gracefully as possible (if you hurt yourself, you hurt your team). If you have to stop moving, pick a protected spot -- or don't stop until you're out of range. SHOOT, THEN MOVE. Even if opponents know you're in the area, don't let them know exactly where you are at any particular time.
5. THINK AHEAD. Once you learn how to read the terrain (ambush areas, movement routes, weak spots, etc.), begin considering how your opponents might use it against you. If you spot an opponent moving in your area, ask yourself where he'll stop and where he'll go to next. If you're moving to another location, you should be looking where you might be spotted from and where you'll go after you reach your next destination. A lot of players have picked a spot where they have nowhere else to go -- thus neutralizing themselves.
6. OUTFLANKING WORKS. Frontal attacks are costly in terms of time, ammunition, and teammates. One defender in a good position can hold up, eliminate, or otherwise neutralize up to five opposing attackers, unless one of those attackers goes to a flank position and hits the defender from the side or behind. A buddy pair works because they can split up momentarily to hit an opponent from two different angles. Two pairs work even better against multiple opponents. If you're being outflanked, move to another position -- you can't shoot effectively in two different directions.