FOX NEWS: Air Force preps 'block 4' variant of the F-35, new weapons and tech for 2020s

Air Force preps 'block 4' variant of the F-35, new weapons and tech for 2020s



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.