Ammo:

Increased ammo storage

 

Dexterity:

Speeds up reload and weapon swapping.

 

Sensor:

Increases both the range and sensitivity of the motion sensor

 

Awareness:

Ability to see motion sensor even when using scoped-in weapons

 

Stability:

Steadies your weapon while being struck by incoming fire.

 

Explosives:

Alters grenade performance, increasing blast radius and decreasing grenade damage received.

 

Wetworks:

 Allows Spartans to Sprint quietly. They also appear as an outline to players using Promethean Vision and perform quicker assassinations.

 

Gunner:

Increases how long a mounted weapon can fire before overheating as well as movement speed with detached turrets.

 

Ordnance Priority:

In modes with personal ordnance, offers more frequent ordnance drops to the user.