You can only choose one equipment per class.
Frag
Description: You only get 1 cookable frag grenade. You can "cook" a grenade by holding down the throw button and waiting for a while. After you throw it, the grenade will explode much faster and that way you have a better chance of killing someone. Frags can easily bounce and roll downhill.
Unlocked at level 4.
Semtex
Description: You get 1 Semtex grenade. It can't be cooked like a frag grenade and the throwing distance is much shorter. Semtex grenades have a blinking red light and a loud beeping sound, which increase as it's about to explode.
These stick to almost anything, even on other players. Use these against Riot Shield users, it's a certain death to them.
Unlocked at level 4.
Throwing Knife
Description: You only get 1 knife, but it's a one-hit kill, if it hits. Hold down the throw button to get an aiming reticule, after that release the button to throw the knife.
Throwing Knives can be picked up and used again, so don't loose it. The knife travels in an arc and isn't meant for long distant throws, not accurate ones at least.
Unlocked at level 7.
Tactical Insertion
Description: Light the flare and drop it on the ground. When you die, you will respawn next to the flare, which will disappear, so remember to use another one. Tactical Insertions can be picked up and used on another spot.
Flares can be easily destroyed by the enemy, so remember to hide them well. Friendly flares are green and enemy ones are red. Use the SitRep perk to see enemy Tactical Insertion more clearly.
Unlocked at level 11.
Blast Shield
Description: Reduces explosive damage to 65%, thus ensuring high survivability. This can be equipped as pleased, but it only protects you when it's on. Combined with the Riot Shield, you can survive almost everything head-on.
When the Blast Shield is equipped, it blocks the edges of your screen and your radar as well.
Unlocked at level 19.
Claymore
Description: You get 1 proximity activated explosive mine. The claymore activates after detecting an enemy and there is a 0.75 second delay before detonation, which you can be increased to 3 seconds with the Scrambler Pro perk.
This is useful for snipers and campers that want to protect their back.
Unlocked at level 31.
C4
Description: You get one C4 explosive. Using this is pretty straight forward: throw the satchel on the ground and blow it up by pressing the same button.
Unlocked at level 43.
