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The Guided Bomb Unit 28 (GBU-28) is a 5,000-pound (2,268 kg) laser-guided "bunker busting" bomb nicknamed "Deep Throat" (and unofficially nicknamed "The Saddamizer" by a design team worker, alluding to its initial purpose of bombing a bunker believed to be then-occupied by Saddam Hussein during Operation Desert Storm) produced originally by the Watervliet Arsenal, Watervliet, New York. It was designed, manufactured, and deployed in less than three weeks due to an urgent need during Operation Desert Storm to penetrate hardened Iraqi command centers located deep underground. Only two of the weapons were dropped in Desert Storm, both by F-111Fs. The Enhanced GBU-28 augments the laser-guidance with Inertial navigation and GPS guidance systems.〔(【引用サイトリンク】url=http://www.saffm.hq.af.mil/shared/media/document/AFD-070223-238.PDF )〕 ==Design and development== In August 1990, the U.S. military began planning an air offensive campaign against Iraq. Planners noticed that a few command and control bunkers in Baghdad were located deep underground to withstand heavy fire. Doubts were raised about the ability of the BLU-109/B to penetrate such fortified structures, so the USAF Air Armament Division at Eglin AFB, Florida was asked to create a weapon that could, and engineer Al Weimorts sketched improved BLU-109 variants. By January 1991, as the Persian Gulf War was well underway, it was determined that the BLU-109/B-equipped laser-guided bombs (LGB) would be unable to penetrate fortified bunkers deep underground. The initial batch of GBU-28s was built from modified 8 inch/203 mm artillery barrels (principally from deactivated M110 howitzers), but later examples are purpose-built with the BLU-113 bomb body made by National Forge of Irvine, Pennsylvania.〔 They weigh 4,700 pounds (2132 kg) and contain 630 pounds (286 kg) of high explosive. The GBU-28 C/B version uses the 4450 pound BLU-122 bomb body, which contains AFX-757 explosive in a 3500 pound casing machined from a single piece of ES-1 Eglin steel alloy.〔(【引用サイトリンク】url=http://www.gd-ots.com/download/BLU-122-B.pdf )〕〔(【引用サイトリンク】url=https://www.fbo.gov/index?s=opportunity&mode=form&id=b425c0654dca9eb2ecab6539b2d26cc8&tab=core&_cview=1 )〕 The operator illuminates a target with a laser designator and the munition guides itself to the spot of laser light reflected from the target. The bomb underwent testing at the Tonopah Test Range, Nevada, a test facility for United States Department of Energy funded weapon programs. An F-111F of the 431st TES (Test & Evaluation Squadron) based at McClellan AFB in California dropped the first GBU-28 at Tonopah. It proved capable of penetrating over 30 meters (100 ft) of earth or 6 meters (20 ft) of solid concrete; this was demonstrated when a test bomb, bolted to a rocket sled, smashed through 22 ft (6.7 m) of reinforced concrete and still retained enough kinetic energy to travel a mile downrange. The GBU-28 is unique in that the total development time from conception to the first drop test took only two weeks, and the weapon went into active service after only one test drop, at Eglin AFB, Florida on 19 February 1991. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「GBU-28」の詳細全文を読む スポンサード リンク
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