Literally millions of officers, troopers, pilots and gunners fought and died under the leadership of Emperor Palpatine. The most obvious and accurate were the Imperial Storm Troopers, they were clad in shiny white armour and armed with the most modern cheap guns in the Galaxy. They were the replacements for the Clone Troopers of the Clone Wars.
They were known for their never ending loyalty to their leadership, they were usually incapable of accepting bribery or refusing an order. Their loyalty to their Emperor was so solid that after the battle of Endor, many Storm Troopers remained Imperial and fought to their last breath in Palpatine's name.
There were many different types of Storm Troopers, different types for different locations, missions and habitats. Sand Troopers were sent to dusty planets often with very hot temperatures, they were heavily equipped with advanced weaponry and were well trained to survive in the wild.