Dagger
Modern period (19th–21st century)

WW1 trench warfare caused daggers and fighting knives to come back in play. They also replaced the sabres worn by officers, which were too long and clumsy for trench warfare. They were worn with pride as a sign of having served front line duty.

Daggers achieved public notoriety in the 20th century as ornamental uniform regalia during the Fascist dictatorships of Mussolini's Italy and Hitler's Germany. Dress daggers were used by several other countries as well, including Japan, but never to the same extent. As combat equipment they were carried by many infantry and commando forces during the Second World War. British Commando and other elite units were issued an especially slender dagger, the Fairbairn–Sykes fighting knife, developed by William E. Fairbairn and Eric A. Sykes from real-life close-combat experiences gained while serving on the Shanghai Municipal Police Force. The F-S dagger proved very popular with the commandos, who used it primarily for sentry elimination. Some units of the U.S. Marine Corps Raiders in the Pacific were issued a similar fighting dagger, the Marine Raider stiletto, though this modified design proved less than successful when used in the type of knife combat encountered in the Pacific theater due to this version using inferior materials and manufacturing techniques.

During the Vietnam War, the Gerber Mark II, designed by US Army Captain Bud Holzman and Al Mar, was a popular fighting knife pattern that was privately purchased by many U.S. soldiers and marines who served in that war.

Aside from military forces, most daggers are no longer carried openly, but concealed in clothing. One of the more popular forms of the concealable dagger is the boot knife. The boot knife is nothing more than a shortened dagger that is compact enough to be worn on the lower leg, usually by means of a sheath clipped or strapped to a boot or other footwear.
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