A key nuclear modernization program, the B61-12 tailkit assembly life-extension program, requires about $52 million more for production in fiscal year 2019 than anticipated, according to the Air Force's latest budget request. The Air Force plans to ramp up from 30 units in FY-18 to buy 250 units in FY-19 and 533 in FY-20, for a programmed total of 813. The FY-18 budget planned to request $120.6 million for B61 research and development in FY-19, but dropped to $91.9 million...