Mandalorian Shock Trooper

The name employed by the Mandalorian Crusader supercommando's 5,000 years before the Battle of Yavin to describe the grey skinned Taung's clans of soldiers. These were fierce warriors and started the tradition of Mandalorians who would follow the Mandalorian Canon of Honor and developed a reputation as deadly soldiers. They were recognisable for their distinct armour designs and gradually changed from being a large army of crusaders into smaller mercenary groups which divided into two camps; the Mandalorian Death Watch and the True Mandalorian's.

Mandalorian Shock Troopers were frequent enemies of the Jedi during the days of the Old Republic and, at times, were allies of the Sith.

Source

 * The Empire Strikes Back
 * Star Wars: Episode II Visual Dictionary
 * Star Wars Insider Magazine
 * Jango Fett: Open Seasons
 * Star Wars: Republic - Show of Force