I really don't know, has there ever been? They're our allies and all and we send them 3 billion dollars a year just asking if they're ...helpin out.
But Israel says your threat is Iran. Let's see...USA spends more on military, defense, and WMD than most world countries combined, yet a 2nd world oil-rich country located 10,000 miles away is a threat?? Let we forget: only 2 things came out of WW2 (partially led by President Rosenfeld (his real name)) 1. Europe was plunged into decades of brutal communism. 2. Israel got their own state. What do they have planned for WW3? The real terrorists already crashed our markets by 50% plus.
No regular troop presence. Have diplomats and specialists come through from time to time, under anonimity. Israeli intel is on the ground and collecting lots of data, though. This is pretty normal though, they've been gathering data on Iran for a long time, and now they have a logistical base of support in Iraq to step off from, and to return to. Pretty standard shit, really.
Sure they are helping and more than you imagine. But Israeli troops on the ground of an arab country would be a huge problem, not help. Not that I expect an ignoramus like yourself to understand even the basics of geopolitics.
http://www.ifamericansknew.org/ Our aid policy reminds me of the fat kid who makes friends by buying others candy.