Well they shared the iron dome schematics with the U.S. (as part of an agreement where U.S. partially funded it)

Israel has provided lots of other services to the U.S. Its pharma company Teva probably produces more generic medications in the U.S. than any other pharma companies (I imagine for a significant number of these, the brand-name trademark would be held in Russia or China)

They provide training to American police.

They provide a place for military tech contractors to field-test their surveillance and murder technology against a captive population

They provide software which aids the U.S. own surveillance and privacy violation of its citizens (Cellbrite and Pegasus for example)

The alliance isn't always amicable; Israel has hacked the U.S. government before to get confidential information, and there is an argument that they collect dirt on influential people such as politicians to ensure their loyalty. At the very least, they provide a way for U.S. lawmakers in their good graces to receive additional sources of funding (through PACs), in exchange for occasional diversion of public funds to them.

They also serve as a foothold into the middle-east for the U.S. to exert political pressure on nearby countries, and provide "diplomatic" avenues to protect their access to oil reserves (including those in Palestine, such as the Chevron-owned, and currently inactive, Mari B oil field off the coast of Gaza)