The Navy has resumed at-sea testing of the Standard Missile 6 (SM-6) system in Hawaii, hoping to verify engineering changes made following failures last summer, according to Navy officials and Pentagon documents. Success in the at-sea testing is seen as essential to avoid a delay in plans to field the first operational systems in fiscal year 2011. “Testing is currently under way at Pacific Missile Range Facility,” Chris Johnson, a spokesman for Naval Sea Systems Command, told InsideDefense.com. Operational...