The main armament of the A-10, the GAU-8 Avenger Vulcan cannon, no longer does its job against modern armor.  It still has all sorts of rockets and missiles it can be equipped with that do, but so do many other planes.  It&#x27;s fine in asymmetric conflicts like the current wars, where targets are slightly armored if that, but it will no longer serve its purpose in a war of first world nations.