https://en.wikipedia.org/wiki/United_States_Fifth_Fleet

> Well, even a blind pig finds an acorn once in awhile. While working on a recent piece on how to cut $1 trillion from the $7-trillion-plus U.S. defense budget over the coming decade, I stumbled upon a provocative analysis by Roger Stern, an economic geographer at Princeton University. He says the U.S. has “mis-allocated” — others might say “wasted” — $8 trillion since 1976 protecting the oil flow from the Persian Gulf that fuels much of the global economy. Especially since in 2010, when the U.S. was the destination of less than 10 percent of the oil flowing out of the Gulf.

> The U.S. has insisted, since the days of the Carter Administration, that the oil flowing out of the Persian Gulf is a vital national-security interest of the U.S. Beyond that, Presidents and the Pentagon have said, the narrow Strait of Hormuz is a vulnerable bottleneck for shipping headed out of the Gulf. Any troublemaker — especially Iran — could bring the U.S. and world economies to their collective knees by shutting it down by sinking a couple of tankers as they pass through. Consequently, the U.S. has poured tons of money into the region since then, including three wars. It has bulked up its military forces in the neighborhood — including the U.S. Navy’s 5th Fleet, headquarters in Bahrain, smack dab in the middle of the gulf — to keep the oil flowing.

http://nation.time.com/2011/04/24/a-question-for-the-obama-a... (Have we wasted $8 trillion defending the Persian Gulf from a non-existent threat?)