Earlier quoted context omitted.
The primary reason why Israel is widely considered an ally is their extensive intel network across Arabia and possibly half of Africa. No one matches the Mossad and the semi-private private intel industry of Israel in terms of capabilities. Another reason is that Israel is a relatively stable, Western aligned democracy in a sea of dictatorships, kingdoms, fiefdoms and failed states... which are all organized in OPEC.…
But OPEC is not a military organization. It is just minor countries trying to agree on a fair and just price of oil.
Well, and that power can be abused as well, particularly for a military that relies on fossil fuels as extensively as the US. Additionally, there's not just the "classic" way of fighting wars (i.e. shooting stuff and blowing up stuff), but there's also economic warfare - and hiking the price of a vital good in war is an extremely effective weapon.