Blitz

"Move it, troopers, on the double! Fire!"

- Blitz leading three Advanced Recon Force troopers to destroy the Trident drills

"Blitz" was the nickname of an Advanced Recon Commando Clone Commander and Commander in Rancor Battalion. Oversaw clone trooper training during the Clone Wars. He wore ARC trooper armor.

Early Life
Blitz like all clones was created on the aquatic planet of Kamino, from the DNA of the late bounty hunter Jango Fett. Later at an unknown time during the Clone Wars he was promototed to ARC trooper rank and a Commander in the Rancor Battalion.

Training Cadets
During the Clone Wars, he was stationed on Kamino and oversaw clone trooper training with ARC Commander Colt and several others, hoping to find future ARC troopers.

Battle of Kamino
He later participated in the defense of Kamino, when Trident drills attacked he lead three Advanced Recon Force troopers to destroy them. Blitz and another ARC trooper were the only survivors of the few ARCs that participated in the battle.

Behind the scenes
Blitz first appeared in the episode "Clone Cadets" albeit unidentified. He was first identified in the new Star Wars canon, on the back of the Rank & File card for Clone Lieutenant Galle released through the Star Wars: Card Trader app. It included his picture and name on the back. There also in the app is a card that includes Blitz alongside Anakin Skywalker, Obi-Wan Kenobi, and Yoda but you'd have to look at card info.