Gregor

"You will be remembered, Captain Gregor. We'll take your heroic story back to the Republic, and we will watch for your return."

- Colonel Gascon

CC-5576-39, who came to be known by the name "Gregor", served as a clone commando and clone trooper captain with the Grand Army of the Republic, fighting the Clone Wars. He was still alive and active in the fight between the Galactic Empire and a group of rebels about 4 years before the Battle of Yavin.

The Clone Wars
Gregor was in command of Foxtrot Group, an elite squad of clone commandos, but was reported missing in action during the Battle of Sarrish. He ended upon Abafar with amnesia and was given a job as a dishwasher at the Power Sliders diner by Borkus for nothing more than room and board. After Colonel Meebur Gascon and his team of droids ended up on Abafar, they helped him to recover his memory and he in turn helped them to escape, but was left alone on the planet surrounded by hostile forces and facing near-certain death. He survived and was promoted to Commander.

Under the Empire's reign
Against all odds, Gregor somehow survived the Clone Wars. 15 years after the Empire's birth, Gregor was living with Captain Rex and Commander Wolffe in a AT-TE.

Behind the scenes
Gregor was first seen in "Missing in Action," an episode of the fifth season of the Star Wars: The Clone Wars television series. A preview clip featuring Gregor was later shown at Celebration VI. He is voiced by Dee Bradley Baker. A trailer for the show's fifth season includes Aurebesh on Gregor's profile notes indicating that he went missing in action during the Battle of Sarrish.

During the episode, a hologram showing Gregor's military records was displayed in Aurebesh after R2-D2 scanned his identifying code. As well as displaying Gregor's status as MIA during the Battle of Sarrish, it displayed 'Sgt 1st Class', '212 Attack Battalion' (most likely referring to the 212th Attack Battalion) and 'Foxtrot Group', as well as Gregor's height and weight. The designation of Sgt 1st Class contradicts Colonel Gascon stating that Gregor was Captain, despite the fact that Gascon was going off of the hologram.

The markings on Gregor's helmet were inspired by the hash-marks that Boston Bruins goaltender Gerry Cheevers stenciled on his mask to denote the stitches he would have gotten had he not been wearing protective gear.