"You tell me why the U.S. would tell them to stop."
Well, I would HOPE, it's because Israel has to UNLOAD, and LOAD-UP some of these that are from the deliver from the US onto those "airplanes":
http://www.globalsecurity.org/military/systems/munitions/moab.htm
I REALLY hope we gave them at least 2 dozen or so !!!
Interesting how it has a Biblical name....