The F-35 joint program office is looking closely at Block 4 requirements, priorities and costs over the next few months as it works toward getting an approved capabilities development document from the Joint Requirements Oversight Council in December. Maj. Gen. Jeffrey Harrigian, director of the F-35 integration office, said during a May 21 Air Force Association event that although the Air Force intends to achieve initial operational capability in August 2016 with Block 3i software, it needs to take a...