TESTING LIGHTNING Marines load ordnance onto an F-35B Lightning II during operational testing aboard the USS Wasp at sea, May 27, 2015. Marines and sailors have been working together since May 18 to assess the integration of the F-35B Lightning II, which is on track to replace the F/A-18 Hornet, AV-8B Prowler and AV-8B Harrier. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 765608-N-BQG38-608.jpg Photo Gallery