The Government Accountability Office (GAO) has advised the Pentagon to hold off moving into full-rate production with the F-35 fighter until the plane's crucial issues are resolved, a potential new delay before lead contractor Lockheed Martin (NYSE: LMT) is able to fully cash in on the long-troubled program.The GAO, in an annual report on the program, lists 966 open deficiencies in the F-35 as of January, and said that about 20% of them will not be resolved before full-rate production under the Pentagon's current schedule.