Every enemy that takes explosive damage is marked as a red arrow on the radar, which also shows the direction the enemy is facing.

Pro Ability: Same as above, but it's achieved by causing bullet damage to the enemy.

Sleight of Hand / Sleight of Hand Pro

Reload your weapons 50% faster than normal. Sleight of Hand is extremely useful with Light Machine Guns since they have long reload times.

Pro Ability: Pick up and swap weapons 50% faster than normal.

Blind Eye / Blind Eye Pro

Enemy air support and sentries can't detect you.

Pro Ability: Faster launcher lock-on + extra bullet damage vs. enemy air support. This makes Light Machine Guns extremely effective against enemy air support.

Allows you to sprint 2x times longer. Press and hold the left analog stick on the Xbox 360 (LS) or PlayStation 3 (L3) to sprint.

Extreme Conditioning is useful for aggressive rush tactics.

Pro Ability: Climb obstacles faster.

Scavenger / Scavenger Pro

Replenishes your ammunition when you walk over Scavenger bags that are dropped by players when they die. Grenade launcher ammo can only be replenished if the player that dropped the Scavenger bag had the same ammo.

Pro Ability: Extra starting magazines.