It's old in so much that a lot of the machinery is undergoing refitting or replacement, or does not fit anticipated future theatre like disputed islands etc.

And some of it, though in use, is just literally old. The M2 Bradley is 40 years old and current model was updated 20 years ago. New machinery is being sought to replace the Bradley and Abrams etc.

That's not to say new equipment isn't being sent. It is! And again it is getting a lot done for it's money. It's the best sales pitch there is.

The purpose of the military budget is to mitigate risk to ones country. The risk to America is being significantly weakened for the cost of sending old equipment to an ally. In terms of affecting Russian military. Gathering gold standard data. And creating new allies and stealing a spot on the game board. It's a massive bargain for America right now

And thus summoned Colossus, the world eater.