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The GBU-57A/B Massive Ordnance Penetrator (MOP) is a precision-guided, 30,000-pound (14,000 kg) "bunker buster" bomb used by the United States Air Force. [2] The GBU-57 (Guided Bomb Unit-57) is substantially larger than the deepest-penetrating bunker busters previously available, the 5,000-pound (2,300 kg) GBU-28 and GBU-37 .
Alfalfa (/ æ l ˈ f æ l f ə /) (Medicago sativa), also called lucerne, is a perennial flowering plant in the legume family Fabaceae.It is cultivated as an important forage crop in many countries around the world.