CT-1127/555, also known as Slick, was TIV pilot during the Clone Wars. He was from the same batch as Sicko, the same pilot that flew for the Republic Commando unit - Omega Squad (for those of you that haven't read Republic Commando, they are some of the main characters). Slick and his batch took Sicko's loss pretty badly. His especially because of the credit given to the civilian pilot that killed Sicko when the civilian thought there were pirates boarding his ship and not Republic Commandos.
Slick continued through the War without a scratch but saw buddy after buddy get killed. Finally, he just gave up when the Chancellor declared himself Emperor. A rumor reached him about some other Clones that had a way out for deserters. Not only could they get out of the Grand Army but they could also receive a cure to counter the age acceleration all clones had to face.
Months later, A Mandalorian is seen in a cantina on Dantooine with a helmet that is reminiscent of Clone Trooper Pilots. Sleeko Renfrea is his name and when asked about his helmet, he would tell folks that there is so much surplus out there that the Imperial military was just giving away Clone War era goods. Suffice it to say, he was also selling his services as a pilot. Go figure.