Imperial Shock Trooper

Imperial Shock Troopers are elite members of the Stormtrooper Corps that specialize in the use of various non-standard weapons and equipment. They are distinguishable from standard Stormtroopers by their extra heavy plate armor. Imperial Shock Troopers are trained to fulfill various battlefield roles and carry a wide variety of equipment. Some, equipped with rocket launchers and thermal detonators, act as anti-vehicle units on the battlefield. Others, equipped with DC-15A Blaster Rifles and DC-17m Interchangeable Weapon Systems, act as security on strategic locations throughout the Empire. Some Shock Troopers utilize jetpacks for additional mobility in battle, much like the Imperial Jumptroopers.

The success of the Shock Troopers has given rise to two further variations on the unit, the Imperial Elite Guard and the Imperial Marines. =Sources=
 * Wookieepedia