Instruction Kit
There are 3 forces and 7 different kits to play as in Battlefield 2. Each kit comes with a unique set of weapons. Within each kit, there are slight differences between each force. You can change which kit you are playing with by selecting it on the Spawn Screen after you die. You can also change while still alive by grabbing a Kit off of a downed soldier.
Engineer
Engineers are the only class that can make repairs to damaged utilities and vehicles, and you get points
for doing so. The Wrench can repair vehicles, bridges, destructible map features, and, most importantly,
command structures. If the enemy team takes out your artillery, radar, or UAV trailer, use
the Engineer Kit to repair them immediately to give your Commander access to these all important
tools. You can also use the Wrench to remove Mines and Claymores from the ground.
When using the Wrench, highlight the structure you would like to repair and hold down the Left Mouse Button. The structure will slowly be repaired. You can see its progress on the lower right hand side of you HUD next to a small shield icon.
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Engineers sitting in nearby vehicles will make automatic repairs. If you have a squad riding in two vehicles, an engineer in each can help alleviate and damage you take while enroute to your destination.
Mines are designed for taking out vehicles. Place one on the ground in highly traveled areas ( such as bridges and access roads near Capture Points) and whenever a vehicle drives over it, the Mine will go off. This makes for a great defensive maneuver.
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The Engineer class is equipped with a shotgun that is only effective at extremely close range. For this reason, it is best to stay close to a vehicle based squad. They'll provide the long range munitions while you provide support. If you're playing as a Commander, an Engineer is a great choice. Sit in the main base and give your commands. If any Special Forces teams destroy your command structures, you can easily repair them yourself.
Anti-Tank
Anti-Tank Kits have the biggest infantry controlled weapon in the game - a devastating missile
capable of blowing up almost anything it hits. Although classified as Anti-Tank, you'll have to
attack an armored vehicle from behind to take it out effectively. However, the guided
missiles included in this Kit work wonders against smaller vehicles and helicopters. To guide the missile, fire the weapon
and then point the curser in the direction that you'd like the missile to go. It isn't perfect, but its better than having no control.
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The Anti-Tank Missiles have a slow reload time and don't carry much ammo. To make matters worse, the machine gun they carry is underpowered and inaccurate. Team up with a Support Unit and you'll be able to play off each other's strengths and weaknesses. Support units can quickly replenish your supply of missiles and lay down covering fire while the Anti-Tank Kit uses the big weapons. Since both Kits have body armor, this makes for an extremely effective assault or defense mini-squad.
Assault
The Assault Kit has the weapons and the armor needed to make it great for attacking enemy
Capture Points. The machine guns they carry are powerful and accurate. A Squad full of Assault
Kits that rolls into enemy territory on vehicles as a solitary group is tough to overpower.
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Although the Assault Kit only has access to Smoke Grenades, the grenade launcher (armed with the 4 Key) more than makes up for this lack of destructive capability. The grenade launcher is a great tool against heavily guarded Capture Points, mobile Squads, and even small vehicles. Practice aiming it and you can kill multiple targets with a single shot.
The Smoke Grenade can be useful in both offensive and defensive situations. Use it to conceal movement by throwing one into an open area before your squad moves through. Or, throw one into an enemy controlled Capture Point to break up their defenses by adding confusion.