A government watchdog's analysis has found the military racked up billions in unforeseen shipbuilding bills as a result of poor planning for sustainment, a conclusion a top Navy official rebutted as "lacking context." The Government Accountability Office's report , which the Senate Armed Services Committee requested, analyzed the Navy's shipbuilding records for the past 10 years to determine how the service factors sustainment into its acquisition process as well as the accuracy of past cost estimates. "In assessing how these...