Boeing can expect a sole-source contract for redesign, qualification and testing of the US Air Force's largest non-nuclear penetrating bomb, the 13.6t GBU-57 Massive Ordnance Penetrator (MOP). A redacted notice published by the service in mid-October says Boeing is being put on contract for the second phase of a classified MOP modification programme, called Enhanced Threat Reduction Ⅳ. The specialised weapon began development in 2004 and was never intended for serial production. Instead, the GBU-57 is built to order in small quantities by Boeing through the air force's direct attack office at Eglin AFB in Florida.
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