They're being withdrawn because they're shit that cannot survive in a modern battlefield against a peer adversary. Even the Houthis were able to defeat them.

This war has been such an embarrassment to the west. Every single of their Wunderwaffen have turned out to under-perform badly. Patriots can't shoot down missiles -- never have, never will. The only confirmed kills they have in something like 30 years is two friendly fire incidents where they shot down fighter planes on their own side 😂

Challengers are so poorly suited to Ukrainian conditions that they have hardly seen combat at all. Bradleys are not bad but aren't going to change the course of the war. Abrams burn just as well as Leopards, but cost more and perform worse. Stormshadows started off well but the Russians adapted to them and now they're just so-so. American 155mm artillery tubes wear out after just a week of combat, or at least they would if the Ukrainians had any 155mm shells left to fire.

And NATO training is only good for getting people killed -- and I don't mean the enemy.