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STRAIT OF GIBRALTAR - MARCH 31: In this handout provided by the U.S. Navy, the Ticonderoga-class guided missile cruiser USS Vicksburg (CG 69) escorts the Nimitz-class aircraft carrier USS Theodore Roosevelt (CVN 71) by the Rock of Gibraltar March 31, 2015 while transiting the Strait of Gibraltar. Theodore Roosevelt deployed from Norfolk and will execute a homeport shift to San Diego at the conclusion of deployment. Theodore Roosevelt is conducting naval operations in the U.S. 6th Fleet area of responsibility in support of U.S. national security interests in Europe. (Photo by Anthony Hopkins II/U.S. Navy via Getty Images
STRAIT OF GIBRALTAR - MARCH 31: In this handout provided by the U.S. Navy, the Ticonderoga-class guided missile cruiser USS Vicksburg (CG 69) escorts the Nimitz-class aircraft carrier USS Theodore Roosevelt (CVN 71) by the Rock of Gibraltar March 31, 2015 while transiting the Strait of Gibraltar. Theodore Roosevelt deployed from Norfolk and will execute a homeport shift to San Diego at the conclusion of deployment. Theodore Roosevelt is conducting naval operations in the U.S. 6th Fleet area of responsibility in support of U.S. national security interests in Europe. (Photo by Anthony Hopkins II/U.S. Navy via Getty Images

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How U.S. will monitor Iranian ships in Yemen

CNN's Tom Foreman uses virtual reality to show how the U.S. intends to monitor Iranian ships off the coast of Yemen.