Mastermind

Medic
Combat Medic (Ace) is a base damage reduction while reviving teammates. Quick Fix (Ace) decreases deployment time of your doctor bags and applies a 2min damage reduction to anyone who uses your doctor bags. Combat Doctor (Ace) let’s you carry 2 doctor bags, and increases the amount of uses each one has. Inspire allows you to revive allies 2x faster
Controller
A huge survivability boost, this skill tree is indispensable. Forced Friendship (Ace) increases cable tie count, and tying speed on hostages. While having hostages (up to 8) absorb up to 4 damage per hit. It will be your responsibility to watch over the hostages while your team keeps the enemies at bay. Joker (Ace) is where your survivability starts. Able to convert non-special enemies to fight for you. Converted allies do more damage and reduce the overall time to convert enemies. Partners in Crime (Ace), while having a converted enemy, it increases your movement speed, increases your health, and your converted enemy takes 99% less damage.
Sharpshooter
Stable Shot is a base increase to weapon stability.