Imperial Heavy Trooper

The Imperial Heavy Trooper is a variant of the Stormtrooper trained for frontline combat against incredibly powerful enemies such as Wookiees, Trandoshans, and other large aliens. While effective, they are relatively few in number and almost always found at the front of a vanguard where they provide protection for standard stormtroopers and other ranged weapon specialists.

Due to their role in melee based combat, these troopers frequently make use of large electrostaffs against their enemies. The weapons allow them to stun their foes with medium-range electrical arcs and are quite capable of killing a Force-user in close combat. Even without their staffs, Heavy Troopers are skilled combatants in hand-to-hand combat and are capable of quickly taking down their targets with no weapons at all. If they need to use ranged weapons, Heavy Troopers are known to use E-11 Blaster Rifles and T-21 Light Repeating Blasters. Heavy Troopers wear more durable armor than regular stormtroopers, which provides them a limited level of protection against lightsabers. The armor is completely self-contained and comes with its own air supply, allowing them to operate in most hostile environments. The joints of the armor have integrated servos which give Heavy Troopers artificially increased strength and speed. Most heavy troopers are also issued backpacks to hold weapons or other items. =Sources=
 * Wookieepedia