The same traits of character that marked Kenneth N. Walker's life led to his premature death. His most dominant characteristic, an inner drive that kept him at a fever pitch of intensity, was formed during a hard childhood. He joined the US Army in 1917 at age 19. Until 1928, his career was sound but unexceptional. He found his professional stride as a student at the Air Corps Tactical School in 1928-29, when he embraced the concept of the invincible bomber and made it his crusade. He served as bombardment instructor at the school from 1929 to 1934. Walker's years at the Air Corps Tactical School were critical years in the development of US air doctrine. In that process-an intellectual process that had to be primarily theoretical because experience was so limited-Walker advocated bombardment as the means through which airpower in the future would be expressed. He did extensive work on bomber tactics and plane development, the goal of which was to make the bomber capable of defending itself as well as carrying out its offensive mission. Since he envisioned defense against an enemy's air force being accomplished by bombers that would destroy the enemy's planes and facilities on the ground, he saw little value for the pursuit (fighter) arm. Air University Press