CT-18-2224 was a clone trooper who scored very highly in climbing at the clone training facility. He gave himself the nickname Alpine and also the unofficial designation of "mountain trooper." He wrote many letters to the Jedi Council and various Republic Senators to recognize mountain trooper as an official branch of the Clone Army, complete with a snazzy new outfit that he'd designed himself, but they all refused.
In his spare time, Alpine hung out with his bestest buddy ever, clone missile specialist CT-18-2223 ("Bazooka"). Sometimes he visited the state fair and helped out little kids who'd been separated from their families. Other times he just made "mi-mi-mi-mi-mi-mi-mi-mi" sounds.
Now you know all about Alpine. And knowing is half the battle.