Israel isn't really an asset to the US, it is more of a liability that we tolerate.
We give them aid to prevent another attempt at conquest by neighbors. The other prong of that fork is that we also pay Egypt (check out the list of top US aid recipients over the last few decades) to keep them out of any war-coalition of Israel’s neighbors, significantly reducing any such move’s likelihood of success.
Why we do that, I’m not sure. I’ve not dug enough into the situation to have a solid answer. Anyone can think of some, but I’m not sure what the actual reasons are. I don’t think it’s anything like “to buy a base in the Levant” though.
https://www.haaretz.com/israel-news/2018-03-14/ty-article-ma...
These facilities are huge, each capable of supporting squadrons of US aircraft.
https://www.americansecurityproject.org/wp-content/uploads/2...
Not even complete. Cairo West isn't on there. https://www.google.com/maps/@30.116667,30.916667,5961m/data=...