The U.S. military's assistance of oil tankers has allowed more than 660 million barrels of crude oil to pass through the Strait of Hormuz since early May. 

Approximately 1,300 vessels have sailed through the strait with the U.S. military's assistance in that time, U.S. Navy Captain Tim Hawkins, a Central Command spokesperson, told CNBC. 

CENTCOM said at the end of July it had helped 1,000 vessels and 500 million barrels of oil to pass through the strait, which means that 160 million barrels have been transported through the blockaded waterway in the past three weeks. 

While the shipments help supply global markets and mitigate energy price shocks, they still don't quite match the 20 million barrels of oil per day that flowed prior to the war in Iran.