Loadout:
Shotgun / Assault Rifle
Pistol

Squaddie:
Swat Shield (Can be used every few turns to grant shield points)
Swat Strike (A melee attack that does a small amount of damage)
Fire Pistol
Grapple

Corporal:
Reflex (When shot at get 1 action point next turn, once per mission without SkirmisherRebalance)
Puglist (+1 dmg & +10 aim on strike attacks)

Sergeant:
Lightning Reflexes
Warning Shot (A shot that deals no damage but can panic a target)

Lieutenant:
Weapon Specialist (+1 dmg with primary weapons)
Fortitude (+10 defense)

Captain:
Untouchable
Punisher (allows strike attacks to crit, confers +25 crit chance on strikes)

Major:
Storm Position (Dash up to an enemy and shoot them)
Takedown (replaces strike, does more damage and has a stun chance)

Colonel:
Rapid Fire
Rupture

GTS:
Rapid Response (+2 mobility & +10 crit chance)