Unlike all other military aid recipients ISRAEL gets the money up-front. That is done so that Israel (again, alone amongst the military aid recipients) can then skim 20% off that money pile and spend it inside Israel i.e. the USA actually subsidizes the Israeli arms industry in competition to its own. NOBODY else is offered those terms, Mark. NOBODY.
UN warns Turkey against calling buffer a 'safe zone' unless guarantees civilians' safety (Reuters)
from the article: U.S. official: More U.S. aid will help Israel make 'tough' decisions