Lieutenant, a commissioned officer. In the United States Army, Air Force, and Marine Corps, lieutenants are the lowest-ranking commissioned officers. There are two grades, second lieutenant (the lower) and first lieutenant. In the Navy and Coast Guard, lieutenants rank above ensigns and below lieutenant commanders. Lieutenant junior grade is equivalent to an Army first lieutenant, and lieutenant is equivalent to an Army captain Originally the term lieutenant referred to any official, civil or military, who took the place of a superior.
The Curtiss JN-4 was produced in such numbers that the plane--sold as surplus following World I--dominated the civil-aircraft market for much of the 1920s. Learn about the Curtiss JN-4, the most famous American training plane during World War I.
The AMX-13 Light Tank was modified to suit the needs of various countries. This tank could be used as both a tank destroyer and a reconnaisance tank. Learn about the history and design of France's AMX-13 Light Tank.