Piett was a loyal Imperial officer aboard Darth Vader's flagship, the Executor, during the Hoth campaign. As an attentive Captain aboard the Super Star Destroyer, he was more creatively minded than his by-the-manual superior, Admiral Ozzel. After Ozzel committed a fatal mistake during the hunt for the Rebels, Darth Vader promoted Piett to Admiral in his place.
Piett served in this capacity during the Battle of Endor. He perished aboard his vessel when a wayward A-wing starfighter crashed into the Executor's bridge.
Admiral Piett profile from starwars.com
Utter legend in the ranks of the Imperial army.
"It's an older code sir, but it checks out."