The National Security Act of 1947 created the Department of the Air Force, but the U. S. Air Force's history began well before that. The U. S. Air Force began as the U. S. Army Signal Corps in 1907. Since then, the branch has progressed greatly, constantly using the latest technology. Through accessible text and eye-catching photographs, readers learn about the U. S. Air Force, past and present. They'll take a look at the many amazing aircraft the branch has used throughout history.