Colonel, a commissioned army, air force, or marine officer ranking above a lieutenant colonel and below a brigadier general. The comparable naval rank is captain. As insignia of rank a colonel in the U.S. armed forces wears a silver eagle on each shoulder. A colonel in the U.S. Army or Marine Corps normally commands a unit larger than a battalion but smaller than a division; an Air Force colonel commands a wing. A colonel may also hold a staff office.
The four-engine Boeing B-17 Flying Fortress was almost certainly the best-loved bomber of World War II. Despite the plane's superiority, Congress didn't authorize its purchase in quantity until war was certain. Learn the story and specs of the B-17.
The term "semi-automatic weapon" is used in the U.S. media often. But what does it really mean? Is it just another term for a machine gun?