Materials
The flak jacket consisted of manganese steel plates sewn into a waistcoat made of ballistic nylon (a material engineered by the DuPont company); therefore, flak jackets functioned as an evolved form of plate armour or brigandine. The first flak jacket weighed 22 pounds.
During the Korean and Vietnam wars, the flak jacket was changed and the manganese steel plates were replaced by other materials. The U.S. Army's vests (Body Armor, Fragmentation Protective, Vest M69) weighed under eight pounds and were made of several layers of ballistic nylon. The vests used by the U.S. Marines (Vest, Armored M-1955) weighed more than ten pounds and were a combination of ballistic nylon layers and fiberglass plates known as Doron. Doron was made of the fiberglass fibers in an ethyl cellulose resin under high pressure. It was named after then Col. Georges F. Doriot, then director of the Military Planning Division, Office of the Quartermaster General.
The generation of armor developed in the 1970s through the National Institute of Justice incorporated layers of soft armor in the form of DuPont’s Kevlar fabric, which has since become synonymous with ballistic protection and a general term used for several similar (aramid-based) materials.
Read more about this topic: Flak Jacket
Famous quotes containing the word materials:
“What is most interesting and valuable in it, however, is not the materials for the history of Pontiac, or Braddock, or the Northwest, which it furnishes; not the annals of the country, but the natural facts, or perennials, which are ever without date. When out of history the truth shall be extracted, it will have shed its dates like withered leaves.”
—Henry David Thoreau (18171862)
“Our job is now clear. All Americans must be prepared to make, on a 24 hour schedule, every war weapon possible and the war factory line will use men and materials which will bring, the war effort to every man, woman, and child in America. All one hundred thirty million of us will be needed to answer the sunrise stealth of the Sabbath Day Assassins.”
—Lyndon Baines Johnson (19081973)
“The competent leader of men cares little for the niceties of other peoples characters: he cares mucheverythingfor the exterior uses to which they may be put.... These are men to be moved. How should he move them? He supplies the power; others simply the materials on which that power operates.”
—Woodrow Wilson (18561924)