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Gravel mines, also called button mines, are small American-made air-dropped anti-personnel mines. They were used extensively during the Vietnam War as part of the McNamara Line. They were also used as a rapid-deployment area denial expedient, to provide a barrier during combat search and rescue (CSAR) operations between downed pilots or other endangered units and infantry threats.
The mines consisted of a small green or brown camouflage fabric pouch filled with lead(II) azide and 30 grams of coarse ground glass between two sheets of plastic. No fuse was required because the explosive became shock-sensitive after dispersal, i.e. able to be detonated without a fuse on contact. The explosive lumps came in wedge or cubed shapes and their plasticizers evaporated after three to eight minutes exposure to air. To allow them to be handled and dropped from the air, the mines were phlegmatized with Freon 113, in which they were stored soaked. Once released from their container, the Freon would evaporate in between 3 and 8 minutes, thereby arming the mines. The mines varied in size, from simple warning bomblets (Button mines), whose detonation was to be picked up by air dropped acoustic sensors and relayed to a central control center [ citation needed ], through to larger mines, while not powerful enough to kill a person outright, they were capable of wounding anyone stepping on it. The larger mines were fitted with a two tablet chemical system to gradually render the explosive inert, although the reliability of this mechanism was never gauged accurately.
The mines were also used by the U.S. during the Battle of Khe Sanh; however, a U.S. Air Force history described them as being "little more than a nuisance," due to the Viet Cong clearing the gravel mine fields by using teams of oxen that dragged logs over them and to the mines themselves becoming inert after a short time. [1]
A total of 37 million gravel mines were produced between 1967 and 1968, though mines were produced into 1970.
The mines were typically deployed from SUU-41A/A and SUU-41B/A dispensers, with the dispensers packed into cluster bomb units with between 12 and 16 dispensers in each cluster bomb. A single bomb could contain between 1,470 and 7,500 mines. The bombs could be dropped from aircraft at between 60 and 6000 meters and at speeds of 370 km/h to 1300 km/h. The dispensers would burst at an altitude of between 200 and 300 meters, scattering the mines.
Name | Shape and size | Explosive content | Type | Notes |
---|---|---|---|---|
XM22 | Quadrant, radius 64 mm | 11.6 g of RDX/Lead azide | Explosive | |
XM27 | Quadrant, radius 83 mm | 27.7 g of RDX/Lead azide | Explosive | |
XM40E5 | Rectangle 45 by 32 mm by 10 mm | 0.54 g of Chlorate/Phosphorus based explosive | Illumination / Warning | "Wet" weight 6 g. |
XM41 | Quadrant, radius 89 mm | 16.3 g of RDX/Lead azide | Explosive | |
XM41E1 | Square, 70 to 77 mm | 9.4 g of RDX/Lead azide | Explosive | |
XM44 | Square, 25 mm | T77 or XM114 electrical detonator | Warning | |
XM45E1 | Rectangle, 45 by 32 mm | 0.7 g of RDX/Lead azide | Explosive | |
XM65 | Rectangle 76 by 70 mm | 10.3 g of RDX/Lead azide | Explosive |
A land mine, or landmine, is an explosive weapon concealed under or camouflaged on the ground, and designed to destroy or disable enemy targets, ranging from combatants to vehicles and tanks, as they pass over or near it.
The GATOR mine system is a United States military system of air-dropped anti-tank and anti-personnel mines developed in the 1980s to be compatible with existing cluster dispensers. It is used with two dispenser systems—the Navy 230 kg (500 lb) CBU-78/B and the Air Force 450 kg (1,000 lb) CBU-89/B. Additionally the mines are used with the land- and helicopter-based Volcano mine system.
Operation Igloo White was a covert United States joint military electronic warfare operation conducted from late January 1968 until February 1973, during the Vietnam War. These missions were carried out by the 553rd Reconnaissance Wing, a U.S. Air Force unit flying modified EC-121R Warning Star aircraft, and VO-67, a specialized U.S. Navy unit flying highly modified OP-2E Neptune aircraft. This state-of-the-art operation utilized electronic sensors, computers, and communications relay aircraft in an attempt to automate intelligence collection. The system would then assist in the direction of strike aircraft to their targets. The objective of those attacks was the logistical system of the People's Army of Vietnam (PAVN) that snaked through southeastern Laos and was known as the Ho Chi Minh Trail.
The Butterfly Bomb was a German 2-kilogram (4.4 lb) anti-personnel submunition used by the Luftwaffe during the Second World War. It was so named because the thin cylindrical metal outer shell which hinged open when the bomblet deployed gave it the superficial appearance of a large butterfly. The design was very distinctive and easy to recognise. SD 2 bomblets were not dropped individually, but were packed into containers holding between 6 and 108 submunitions e.g. the AB 23 SD 2 and AB 250-3 submunition dispensers. The SD 2 submunitions were released after the container was released from the aircraft and had burst open. Because SD 2s were always dropped in groups the discovery of one unexploded SD 2 was a reliable indication that others had been dropped nearby. This bomb type was one of the first cluster bombs ever used in combat and it proved to be a highly effective weapon. The bomb containers that carried the SD 2 bomblets and released them in the air were nicknamed the "Devil's Eggs" by Luftwaffe air and ground crew.
Anti-runway penetration bombs are explosive weapons involving bombs or bomblets designed to damage or destroy runways, or otherwise render them unusable for aircraft.
The CBU-97 Sensor Fuzed Weapon is a United States Air Force 1,000-pound (450 kg)-class freefall Cluster Bomb Unit. It was developed and produced by Textron Defense Systems. A CBU-97 used in conjunction with the Wind Corrected Munitions Dispenser guidance tail kit is converted to a precision-guided weapon, and the combination is designated CBU-105.
The Mk 20 Rockeye II, CBU-99 Rockeye II, and CBU-100 Rockeye II comprise an American cluster bomb family which are employed primarily in an anti-tank mode against armored vehicles.
The CBU-24 is an unguided, aircraft delivered anti-personnel and anti-materiel weapon developed by the United States. Because it is an unguided weapon, the CBU-24 can be carried and dropped by any aircraft capable of carrying standard "dumb" or "iron" bombs.
BLU-3 Pineapple was a cluster bomblet, 360 were deployed from the CBU-2A cluster bomb. It was used extensively in the Vietnam War by American forces. It was named "Pineapple" because of its appearance. On some Arc Light missions, the B-52Ds carried two SUU-24 dispensers in the bomb bay, containing a total of 10,656 bomblets.
BLU-43/B and BLU-44/B "Dragontooth" were air-dropped cluster-type land mines used by the United States during the Vietnam War. It is chemically activated and has a relatively low explosive content, typically maiming rather than killing.
The HB 876 mine was an air dropped area denial weapon. It was used as part of the JP233 runway denial system and the 'Hades' variant of the BL755 cluster bomb. As a result of the anti-personnel mine ban it was withdrawn from British Royal Air Force service, and the last stockpiles of the mine were destroyed on 19 October 1999.
Operation Niagara was a U.S. Seventh Air Force close air support campaign carried out from January through March 1968, during the Vietnam War. Its purpose was to serve as an aerial umbrella for the defense of the U.S. Marine Corps Khe Sanh Combat Base on the Khe Sanh Plateau, in western Quang Tri Province of the Republic of Vietnam. The base was under siege by an estimated three-divisional force of the People's Army of Vietnam (PAVN).
The Hill Fights took place during the Vietnam War between the People's Army of Vietnam (PAVN) 325C Division and United States Marines on several hill masses north of the Khe Sanh Combat Base in northwest Quảng Trị Province.
The CBU-87 Combined Effects Munition (CEM) is a cluster bomb used by the United States Air Force, developed by Aerojet General/Honeywell and introduced in 1986 to replace the earlier cluster bombs used in the Vietnam War. CBU stands for Cluster Bomb Unit. When the CBU-87 is used in conjunction with the Wind Corrected Munitions Dispenser guidance tail kit, it becomes much more accurate, and is designated CBU-103.
The Wind Corrected Munitions Dispenser or WCMD system is a US tail kit produced by Lockheed Martin for use with the Tactical Munitions Dispenser family of cluster bombs to convert them to precision-guided munitions. In 1997 the United States Air Force issued contracts to complete development and begin production of the WCMD, planning to modify 40,000 tactical munitions dispensers - 30,000 for CEM and 5,000 each for Gator and SFW - at a cost of US$8,937 per unit.
The CBU-55 was a cluster bomb fuel–air explosive that was developed during the Vietnam War by the United States Air Force, and was used only infrequently in that conflict. Unlike most incendiaries, which contained napalm or phosphorus, the 750-pound (340 kg) CBU-55 was fueled primarily by propane. Described as "the most powerful non-nuclear weapon in the U.S. arsenal," the device was one of the more powerful conventional weapons designed for warfare.
The CBU-107 Passive Attack Weapon (PAW) is an air-dropped guided bomb containing metal penetrator rods of various sizes. It was designed to attack targets where an explosive effect may be undesirable, such as fuel storage tanks or chemical weapon stockpiles in civilian areas.
Khe Sanh Combat Base was a United States Marine Corps outpost south of the Vietnamese Demilitarized Zone (DMZ) used during the Vietnam War.
The CBU-72 was a 550-pound (250 kg) American fuel-air cluster bomb used by the United States Military until 1996. It was very effective against armored vehicles, aircraft parked in the open, bunkers, and minefields.