We have almost a thousand F-16s sitting in the high desert, as an example, and it's very dry. They will never be used again, except for occasional parts or to replace the occasional Air National Guard/Air Force Reserve F-16s that are lost or retired for one reason or another. They are in far better shape than aircraft going through the shitshow of Russian aircraft storage where they go well below freezing in winter and bake in the summer, and are stripped for blackmarket parts. Most still have plenty of life in them, they were simply replaced by newer aircraft or retired as the military shrank.
We also have 3,600 Abrams tanks that are sitting in storage, many of which were retired, again, due to a shrinking or changing military, or newer models.
We purchased over 160,000 Humvees, and I'm sure there's a few tens of thousands in storage (although they may not be in the best of shape, *ahem* a lot of us treated them like shit). We probably have a few thousand Bradleys in storage, probably some Strykers in storage. A whole lot of M113s (although those are very old).
Probably have a few hundred Black Hawks in storage as well.
We actually take care of our stuff, unlike the Russians.