It takes a lot to be under siege forever. Israelis want to be loved by the world, especially the USA. My cousin's husband is a colonel in the IDF and he is often sent to D.C. to confer with officers of the US Army. He told me that they look at him with hatred. Antisemitism is not rare in the USA , it seems.
I'm astonished by your post. I had always heard that the US military historically has been Israel's biggest backer in the executive branch. Are you sure that your cousin's husbank believes that this is a generalized feeling among senior US military, and not a personal issue with a few officers?