The Assault class have Personal Shield as a class ability. It has a cooldown of 30 seconds and a duration of 10 seconds. Loadouts of each Assault character are as follows.

Markov: Lightning Gun, Assault Rifle, Arc Mines, Personal Shield.
Hyde: Flamethrower, Minigun, Toxic Grenade, Personal Shield.
Parnell: Combat Shotgun, Multifire Rocket Launcher, Super Soldier, Personal Shield.