As the F-35 Joint Program Office works to finalize a plan for the aircraft's Block 4 follow-on capabilities, the Air Force's Joint Strike Fighter integration office is concerned about how a long-term continuing resolution could impact that plan. The program plans to transition from the Block 3i configuration -- which is what the Air Force will use to enter initial operational capability next year -- to full warfighting capability with Block 3F. Block 4, which will feature follow-on capabilities not...