The U.S. Navy is building a military installation atop this petroleum-export platform as the U.S. establishes a more lasting military mission in the oil-rich north Persian Gulf.

While presidential candidates debate whether to start bringing ground troops home from Iraq, the new construction suggests that one footprint of U.S. military power in Iraq isn't shrinking anytime soon: American officials are girding for an open-ended commitment to protect the country's oil industry.

That is a sea change...