F-35 program officials expect to have a Joint Requirements Oversight Council-approved Block 4 capability development document in hand by late this summer -- a milestone that will solidify follow-on modernization requirements and help set the foundation for the capabilities necessary to operate in the future threat environment. Diane Wathen, the joint program office's follow-on modernization director, told Inside the Air Force this week the program expects the JROC to approve its CDD in August or September. The document, which...