In order to reduce costs on the allready expensive F-35, they’ve decided  to remove the shutoff valves for engine coolant and hydraulic lines and five of six dry bay fire-suppression systems. This means if they get hit by 30mm incendiary AAA rounds (very common), it’ll blow up instead of venting the extra pressure in these liquids.

Also it turns out that the stealth – well, it isn’t so very stealthy after all. Only from 35o from the front quarter, only to certain types of radar (commonly used by ground systems, not by aerial platforms) and don’t make a turn or you’ll get caught.

Gajillion-Dollar Stealth Fighter, Now Easier to Shoot Down.