The F-35 is getting a new brain for Block 4.2 jets delivered after 2023. The upgrade is called Technical Refresh 3, and it's the first major electronic and computer update for the F-35 since Block 3i testing wrapped up in 2016. The contract was awarded to Lockheed this evening. pic.twitter.com/1eZJvrLX85

— Steve Trimble (@TheDEWLine) December 28, 2018