Commodore, a naval rank between that of captain and rear admiral. The U.S. Navy discontinued the rank in 1899 but reestablished it temporarily during World War II. The rank was reactivated in 1982, but in 1986 the name was changed to rear admiral lower half. An officer holding this rank corresponds to a brigadier (one-star) general in the army or air force.
The British de Havilland D. H.4 airplane first flew on August 1916, using a new British engine. The worst of its faults was a tendency to catch fire when its center-mounted tank was hit by gunfire. Read about the D. H.4 and its unfortunate nickname.
The U.S. Army Rangers are an oddity of the U.S. military special operations forces. Though they can trace their lineage as far back as colonial times, they didn't become a permanent presence in the military until the 1970s.