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.
In its first few years, the McDonnell Douglas F-4 Phantom II set eight new aviation records, among them altitude (98,557 feet), speed (1,390 mph), and time to climb (9,000 feet in 34.5 seconds). Learn details about this popular and powerful aircraft.
Soldiers face danger every day -- detecting landmines, deactivating unexploded bombs and scoping out hostile buildings are tasks that don't always require a human presence. That's where military robots come in.