Minute Man II missile with a "replica" nuclear warhead was successfully launched from California's Vandenberg Air Force Base, officials said. The National Nuclear Security Administration conducted the test in cooperation with the U.S. Air Force, an NNSA release said Thursday. The test was to evaluate the overall performance of the U.S. intercontinental ballistic weapon system, NNSA said. "This successful JTA (warhead) test illustrates NNSA's commitment to ensuring that all weapon systems perform as designed," said Brig. Gen. Garrett Harencak, NNSA Principal Assistant Deputy Administrator for Military Application. "The continued strong cooperation between the NNSA and (the Department of Defense) is...