The F-35 Preps for Weapons Upgrade by Dropping New Bombs & Firing Guns The GAU-22 Gun System, Small Diameter Bomb II and GBU-38/54 are all scheduled for additional ground and flight tests Kris Osborn · August 13, 2019 Please leave this field emptyStay Updated with Warrior Maven Subscribe for daily military news and updates delivered straight to your inbox. We don’t spam! Read our privacy policy for more info. Check your inbox or spam folder to confirm your subscription.