Arquebus, or Harquebus, an early firearm. Several types of firearms were known by the name arquebus during the 16th and 17th centuries. All were fired from the shoulder or chest. The firing mechanism was originally a matchlock, a device that held a piece of burning wick and touched it to the powder in the gun when a trigger was pulled. Later, other firing arrangements were used.
Nations are facing a more guerilla-style warfare – even at sea, and the equipment must evolve to meet new demands. Enter the Sea Fighter. Learn about this experimental, high-speed, "invisible" ship.
This week, U.S. officials said they dispatched scientists in December to search for dirty bombs in five U.S. cities, after learning of possible New Year's Eve terrorist attacks. Learn all about these crude weapons.