The Pentagon's top officer today said the military's acquisition system is riddled with systemic challenges that generate "way too many major programs whose costs have gone sky high," adding that the Defense Department needs to rein in requirements in an effort to curtail outlays necessary for new weapon systems. Adm. Michael Mullen, chairman of the Joint Chiefs of Staff, called on Defense Department leaders to improve their understanding of the requirements underpinning the rationale for new capabilities -- as well...