** FILE ** Iranian navy speed boats attend a drill in the Sea of Oman on Friday, Dec. 30, 2011. Iran's navy chief has reiterated for a second time in less than a week that his country can easily close the strategic Strait of Hormuz at the mouth of the Persian Gulf, the passageway through which a sixth of the world's oil flows. (AP Photo/IIPA, Ali Mohammadi)

Photo by: Ali Mohammadi

** FILE ** Iranian navy speed boats attend a drill in the Sea of Oman on Friday, Dec. 30, 2011. Iran's navy chief has reiterated for a second time in less than a week that his country can easily close the strategic Strait of Hormuz at the mouth of the Persian Gulf, the passageway through which a sixth of the world's oil flows. (AP Photo/IIPA, Ali Mohammadi)