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The M67 grenade is a fragmentation hand grenade used by the United States military. The M67 is a further development of the M33 grenade, itself a replacement for the M26-series grenades used during the Korean and Vietnam Wars, and the older Mk 2 "pineapple" grenade used since World War I .
The Mk 2 grenade (initially known as the Mk II), also nicknamed the Pineapple is a fragmentation-type anti-personnel hand grenade introduced by the U.S. armed forces in 1918. It was the standard issue anti-personnel grenade used during World War II , and also saw limited service in later conflicts, including the Korean War and Vietnam War .
The modern fragmentation grenade was developed during the 20th century. The Mills bomb, first adopted in 1915 by the British army, is an early fragmentation grenade used in World War I. The Mk 2 grenade was a fragmentation grenade adopted by the American military based on the Mills bomb, and was in use during World War II. [6]
The M26 is a fragmentation hand grenade developed by the United States military. It entered service in 1952 and was first used in combat during the Korean War, replacing the Mk 2 of World War II. The M26 series was the primary fragmentation grenade used by American forces in the Vietnam War. It was replaced by the M33 series grenade.
In modern grenades, a pre-formed fragmentation matrix inside the grenade is commonly used, which may be spherical, cuboid, wire or notched wire. Most anti-personnel (AP) grenades are designed to detonate either after a time delay or on impact. [1]
The MK 1 is a time-fused fragmentation grenade and has 32 serrations on it. To start the fuse, the user has to pull the safety pin, then push off the cap on top of the grenade. Right before throwing, the user has to move the switch on the lever away from the grenade in order to start the fuse.
The Universal'nyi Zapal, Ruchnaya Granata, Modernizirovannyi (UZRGM) (Russian for 'universal igniter, hand grenade, improved') fuse is a universal Russian type also used in the RG-41, RG-42, RGO-78, RGN-86 and RGD-5 grenades. The standard time delay for this fuse is 3.5 to 4 seconds.
The RGD-5 (Ruchnaya Granata Distantsionnaya, English "Hand Grenade Remote") is a post–World War II Soviet anti-personnel fragmentation grenade, designed in the early 1950s. The RGD-5 was accepted into service with the Soviet Army in 1954.