Sergeant at Arms, the officer of an organization who preserves order during its meetings. A sergeant at arms functions mainly at formal gatherings, where he enforces rules of procedure; in a legislative body he also enforces executive commands. Both houses of the U.S. Congress have a sergeant at arms, as do both houses of the British Parliament.
These 10 technologies changed war and the course of history as we know it. Some of these battlefield innovations, like adding grooves to gun barrels, are surprisingly simple. So what else made our list?
The Chieftan Main Battle Tank had excellent firepower and protection capabilities. Nuclear-biological-chemical protection is featured on this tank through the help of a forced-air filtration system. Learn the history and design of Britain's Chieftan Main Battle Tank.