They aren't called kill steaks, they are score streaks in that game. Basically, you get points for capturing objectives, asissting or getting kills. When you get a certain amount, you are able to choose a score streak with the D PAD. The red one is offensive, such as artillery or airstrikes, while the blue choice is support oriented, such as giving your team ammo, a UAV, or Armor.

Maisuke wrote They aren't called kill steaks, they are score streaks in that game. Basically, you get points for capturing objectives, asissting or getting kills. When you get a certain amount, you are able to choose a score streak with the D PAD. The red one is offensive, such as artillery or airstrikes, while the blue choice is support oriented, such as giving your team ammo, a UAV, or Armor.

Thanks bro finally a response!

Tier 1 Score Chain - 40 points:
Offensive - Mortar Strike
Defensive - UAV

Tier 2 Score Chain - 100 points:
Offensive - Rocket Strike
Defensive - Match Ammo (Increased bullet damage to yourself and nearby team mates until you/they die, +5 points for everyone affected, including yourself)

Tier 3 Score Chain - 160 points:
Offensive - Guided Missile
Defensive - Flak Jacket (It either gives you extra health or a higher resistance to bullet damage, I'm not sure. Same point bonus as above)

Tier 4 Score Chain - 230 points:
Offensive - Artillery
Defensive - FMJ (Full metal jacket rounds, improves bullet penetration, same point bonus as above)

Tier 5 Score Chain - 300 points:
Offensive - Strafing Run
Defensive - Counter Intel (UAV jammer)

Tier 6 Score Chain - 380 points:
Offensive - Airstrike
Defensive - Sabot Rounds (Improved version of Match Ammo, +10 points for each affected player)

Tier 7 Score Chain - 450 points:
Offensive - Cruise Missile
Defensive - Kevlar Vest (Improved version of Flak Jacket, +10 points for each affected player)