Upon joining forces with the continuing war, Barnes and Rogers formed their Howling Commandos, to battle Red Skull's forces. Barnes, along with whoever still remained from his regiment, was later rescued by Rogers, who had become Captain America during Barnes' absence. His regiment was captured by HYDRA, where Barnes was given a variant of the Super Soldier Serum by Arnim Zola. Barnes enlisted in the army and assigned to the 107th in 1943. Sergeant James Buchanan 'Bucky' Barnes is a World War II veteran, a former officer of the 107th Infantry Regiment and best friend of Steve Rogers since childhood. I am James 'Bucky' Barnes, and you're part of my efforts to make amends.' ―Bucky Barnes to L.