The physical pieces of the plane are moving in a good direction. Most of what we have left to do is software. The department (DoD) has not historically been good at software development. That will take a little longer. I cannot imagine building anything for the Air Force that is not software intensive,' Roper said.The Air Force has begun early testing, software development and weapons integration for its upcoming Block 4 variant of the F-35 Joint Strike Fighter, an emerging model intended to give the multi-role fighter a new dimension of attack mission possibilities, service leaders said.The new version, to emerge in the early 2020s, will add new long-range precision-tracking weapons such as the Small Diameter Bomb II and also integrate a computer-generated automatic ground collision avoidance technology.'The next step for F-35 weapons integration will be to address the weapon requirements within Block 4. Integration of the Small Diameter Bomb II has already begun, and flight test is scheduled to start as early as 2019,' Capt. Emily Grabowski, Air Force Spokeswoman, told Warrior Maven in a statement.(This first appeared in April 2018.)The current consensus among senior Pentagon weapons developers holds that, at the moment, the F-35 is the most capable 5th generation plane in the world. Maintaining this edge, however, is anticipated to quickly become more and more difficult now that both Russia and China are building 5th-gen stealth fighters. Click here to read full news..