I hope that you do not mind me posting this. But these are my little tips that I originally posted in another forum. Sorry if it is a bit long. I also added a few things compared to what I originally posted elsewhere. I hope you all like it.
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Shot from the prone position. Crouching helps if in a hurry; but prone is better. Standing is the worst position. It cuts down on accuracy.

Then their is the common sense of using cover. I find that if you position yourself slightly behind objects that it will help conceal you from sight as well as enemy fire.

Always wait for a good shot. The head is the best. I also like the gut for some reason. Even an ankle shot can do damage. Do not be scared to shot someone in a certain part of that you think might not do a lot of damage. You would be surprised how much damage it actually does if you are on target. I have killed many people by shooting them in the foot. As it was the only body in visible sight. just remember to make sure the shot is straight and true. A steady shot is a better shot. Do not be in a hurry.

Think of the surroundings for both you and the area of engagement where your targets might be.:
If you are hidden then you should be safe for a bit.
If you are in the open you might be spotted; so prepare to move to cover. (Relocate) Relocating is a very good practice. When you kill someone; if they are paying attention they will realize what direction the were hit from. This could possibly compromise your position. After a kill you might want to back off and run to another position just to be safe.

Explosive Crates and Barrels. Part of the surrounding that you need to be aware of. These can help or hinder a good recon unit. If you are near them and are spotted the could be used to hurt you or even kill you. Stay clear of these. Yet keep in mind where they are. You can use them to your benefit. These items can be shot to kill multiple targets near them; like I mention that they can be used against you. They are best used as traps.

Make sure to play as recon when you use the recon kit. What I mean by this is that you should always point out the enemy. It is a great benefit to the game. Yet keep in mind that you do not need to keep pointing them out constantly. Wait for the red blinking of the spotted enemy to stop displaying itself on the radars and maps. This way you do not flood the com with repetitive chatter. It can be annoying and lessens the chance of or important communications from getting through. Knowing where all the enemy troops are is a great benefit to winning the battle.

Team play with recon. When in a squad; try to not get to far away from them. Make sure to cover them when sniping. If using the kit like an assault for things like the Titan; make sure to watch their back and remember that your RDX's will kill them when used on FF off servers. Communicate with them and listen to what the Squad leader says.

Know your tools and their uses.:
APM... Use this unlock to protect your sniper position. Place them in areas were the enemy might come from to sneak up on you. Also keep in mind that the sniper rifle ( I think the Zeller only) can be used to detonate them. You can clear enemy mines by shooting them. They to can be used as traps. If an enemy has placed them somewhere and an enemy is near them; you might be able to detonate it causing the enemy to be hurt or killed. This might depend on the server settings. I have used this tactic before to kill the enemy; but have not checked to see if FF needed to be turned on for the server. I got the kill so it might not be . It might need some testings to see.

RDX... These are used for destroying multiple of things. mostly its purpose is for assets. Yet they can be used to set traps as well. If you place them in certain areas, they can be used like the explosive crates and barrels. You can either detonate them by remote. or one ate a time. To detonate them one at a time; you well need to have line of sight on them. It involves you shooting them with the sniper rifle ( I think this is also the Zeller only). This has been very useful for me. You should place these in area that the enemy might go. Like around a flag or silo. Also main corners as well. They are also good for falling back on when your two APM's are used up. If the enemy is coming; say like up a ladder of a tower you can toss one down and remote detonate it to kill him. (Note: Do not use these in the bunny-hop method. It is frowned upon; and is a major server rule for a lot of servers.)

Dys Tek Hi-Scope x4... This unlock can help in aiming it is applied to your rifles when unlocked. To use it; just scroll the mouse wheel when in aiming through the scope. Basically it is self explanatory on the benefits and uses of this unlock. A must for all Recon units. This is passive and does not take up any slots for kit customization.

Net Bat Fade Delay... This unlock is used when in a squad. When an enemy is spotted; their location can be tracked through objects like buildings and walls. It will put a diamond on them which is seen through the said objects. It is very helpful when trying to keep track of the enemy. A must for Squad game play. This is passive and does not take up any slots for kit customization.

Gruber 5 Stabilizer... This unlock will help you get a more accurate shot. You use it by holding the shift key down when looking through the scope. It will help keep the gun from drifting. It runs down; so you have to wait for it to recharge. This is a must for the recon units that want to get the most out of each shot from their sniper rifle. It is my personal favorite unlock for the recon kit.

IT-33... This unlock is a cloak. When selected you hold down the trigger and you will become cloaked. It is best for moving through the battlefield unseen. (Note: It is still possible to see a person using it if the people are looking hard enough. It is like trying to see the Predator. It is a blurry distorted humanoid shape. But do not be discouraged from using it. In the heat of battle and at a distance; it will be hard for them to notice you. You can also hear it when up close to someone using it. This might take a good sound-card for it to work best.) It is best used to sneak by an enemy location or to sneak up on them for a silent kill.

Zeller-H Advanced Sniper rifle... This is an upgraded weapon. People well very on their opinion of this weapon. It is supposed to be a little bit more powerful and a little more accurate. It has a smaller clip/magazine which holds 3 rounds. It has 10 clips/magazines; 1 initially load and 9 spares to fall back on. (The clip/magazine size and amount of ammo is a main request for upgrades to the game by people.) It is 5 less round than the original rifle. The original rifle you have has 7 total clips/magazines with 5 rounds each. I believe that this is the only weapon that can detonate and RDX and an APM. I might be wrong; but that is what I am lead to believe. All the ones that I have blown up have been done with this weapon. Some people do not like the scope compared to the stander rifle you get. I personally like this weapon as my favorite in the game.

Lambert Carbine... This weapon unlock is not the strongest carbine but works well for close courters combat. Like in the Titan or urban settings. It comes with 6 clips/magazines and 30 rounds each. This can become a must have weapon for attacking the Titans.

Northern Strike unlocks.:
TL-S1C... This unlock is an improved version of the IT-33 cloak. It works the same way as the IT-33. It will last longer than the IT-33. It will replace the it when chosen; meaning that it is passive and when chosen is applied to the IT-33 unlock changing it to the TL-S1C.

DS-22 Sniper Decoy... Other wise known as the Ghost. This unlock is a Sniper Decoy device. The opinion on this unlock varies through the community as well. It works by giving a false location of your position on the enemy radars. It must be placed within a 50 meter radius of the enemy radar scans. It will show them a red dot on the radar that is away from your location. Your red dot that would appear for you does not show up. (Their is some speculation that this does not work the way it is supposed to. Some people say that it works while others say that it does not.) For what I have seen it does seem to work. It is best used on the battlefield to lure the enemy into a false state of security. It does this by luring them into an area that has no enemy targets. By doing this you could essentially bring to enemy into your line of site. (Example: Kind of like shooting the enemy communications cable in the middle of no- mans land. They have to send some one out their to fix it; at which time you can pick off each of them when they arrive to fix it.) When place in the right areas; you will want to go to a spot that is in the line of sight of the area that you placed it at. This spot should be a good sniping position; so keep that in mind when placing the DS-22 some where. You also want to make sure that they do not notice it right away. This way it will be more useful too you. (Their is some speculation of how long it will stay their on it own. Some say that it has a timer and will self detonate. Others say that it will last the whole round if not detected or destroyed. I am not sure on this; because I have not tested it in that much detail.) I can say this about it. I like it. It has helped me kill a lot of people. It has also help me distract the enemy long enough for our team to gain control of some very important positions in the game. Any distraction to the enemy helps in battle. It also can be used for sneaking by the enemy; which is a very effective tactic in many games.