WASHINGTON (AP) -- The Pentagon has thrown a cloak of secrecy over assessments of the safety and security of its nuclear weapons operations, a part of the military with a history of periodic inspection failures and bouts of low morale. Overall results of routine inspections at nuclear weapons bases, such as a "pass-fail" grade, had previously been publicly available. They are now off-limits. The change goes beyond the standard practice of withholding detailed information on the inspections. The stated reason for the change is to prevent adversaries from learning too much about U.S. nuclear weapons vulnerabilities. Navy Capt. Greg Hicks,...