Anyway, the 5-man format requires less teamwork than the 7 or 10 man ones. It's common knowledge. BUT, you'll be better off if you do have a team structure. The simplest one is:

1 player at the back. The idea is: the closest to the front you are, the more paint you take, the lower profile you have to have, the less you see. But since you need to keep informed of what's going on, you need a player who will observe, standing up, somewhere behind. This player will be able to move, and will relay information from one wing to the other. Since he will have to make decisions such as shifts or pushes, he usually is the "tactician" of the group. 2 subgroups of 2 players. In each subgroup, there will usually be a player further than the other (usually the fastest one), who will protect him. The way they work will depend of the field.

2 - Use Your Team

A. Walk the field

"Free walking": each player walks around on the field to get a general idea, and spots the main features (width, length, shelters, "paths", etc.) Running: you want to know where the "real center" of the field is, where's what we call "the line of first contact" -- the farthest you can go on the break. Choose a plan: now you know (roughly) where your opponents will be because you know the features of the field, you should see by now where their weakness will be. Your plan must be very simple:
decide where you are going to push. Usually on one side, seldom through the center (when the center is thick or offers good cover). logically, if you push on one side, you defend on the other.
"Individual walking": now you know who's going where. Your best attackers go where you are going to push. Send each subgroup to their area, and let them chose their first shelters, and where they will go if the push goes well or if they have to fall back. "mayday resort": before you walk another field, gather your team around the flag station, and quickly decide where to go to if you have to fall deep back. And ask your team about which side they prefer, so you'll know what to say if you win the toss.

B. Work on your morale - watch your attitude

NEVER GET UPSET.

Having troubles with your equipment is very upsetting. So take care of it, review it beforehand, have some tools and some spares available, even try to have a spare marker that you will carry with you to the chrono station in case anything goes wrong.

Arguing is very upsetting. The golden rule is: only your captain may discuss with the refs. If you think there was a problem on the game, tell your captain, and don't speak unless asked to by the refs or by your captain.

Never argue with one of your teamates. If you want to compliment him, go ahead. But if you think he didn't play well, tell your captain.

The problems of your team are your team's concern. No one else should even know about them.

If someone played well, tell him. Work his morale up. Build a friendly atmosphere among your team.

Ultimately, the art of "blending in" comes down to two major points: 1)Lack of movement, and 2)Lack of overly bright colors. To get a little technical, the human optic system picks up both of these things before anything else. Movement is the number one thing, here - with minimal camoflage, it is possible to stand COMPLETELY IN THE OPEN and not be seen (I've done this before)...as long as you are absolutely still. The human sight also picks out shades that are brighter than the surrounding colors WAY before it detects colors that are darker. This means that true camoflage isn't always the best answer, as too-light camo will stick out like a sore thumb even when compared to someone wearing navy-blue clothes in a woodland setting. What does this all mean? In a nutshell, move as little and as slowly as possible, and make sure your clothing is as dark or darker than the majority of the terrain you'll be playing in. (As a side note, Army surplus stores are the absolute best place to pick camoflage outfits up at.)

Beyond your gun, a good set of goggles in working condition are essential to a game of paintball. Make sure that the lens is not cracked, the mask is tight and fitting properly on your face, and that you can move in it okay. It is very important to remember that paintball masks were designed to withstand the impact of a paintball travelling at 300fps. Although skiing or motorcycle masks and goggles may look safe to play in, they are not designed for it and will probably cause more harm than they will help.

Your gun and goggles are not the only pieces of equipment you need to be concerned about. Comfortable shoes can really make the difference towards the end of the day. Low-cut all-terrain hiking boots are excellent, as are tennis shoes with ankle support. Your footwear should allow you to run full speed, provide excellent traction, and be very comfortable. Wear loose clothing - tight clothing can chaffe and be very uncomfortable after awhile. If you are playing on a cold or snowy day don't be afraid to pile on the layers, as you can always take layers off - There is nothing worse than paintballing cold and wet. Gloves are often overlooked unless it is cold out, but even in the warmer times of the year they can be a life saver. Personally speaking, getting shot in the bare hand really sucks, and can even lead to bleeding. The shell of the paintball has a tendancy to scratch bare skin, so covering your skin up prevents this. If you choose to wear a cup find one that you are going to be comfortable in for 8 hours. If you are going to wear boxers, be sure they aren't too loose - if you've ever tried running a race in them, you'll know what I mean. Cups are also an option for those wishing to keep Mr. Winky intact, although most consider them too cumbersome and annoying to make them worthwhile in the long run.

Avoid flat-out running. Move quickly and smartly, inspect all areas along your route while keeping a good pace. As mentioned above in the Camoflage section, faster movement attracts attention. Running also leads to nasty surprises, as you may stumble blindly into a group of opponents, or even get shot by your own team by startling them.

When you are moving make use of all available cover, double-checking if necessary to make sure that you don't miss any possible routes of attack. Always be ready to fire - keep your gun level and ready for action, as you never know what you might stumble upon. Learn to move sideways as well, keeping your gun aimed in the direction you are traveling. Side-stepping provides a smaller target to shoot at and allows you to move and keep your gun relatively steady.

Another thing to look for when chosing cover is that there is a safe way to retreat from it when the need arises (which is going to happen, sooner or later). If there is no back-route to safety, you're just getting yourself into a position where defeat is inevitable.