A quick check reveals why the Navy is there:
“U.S. Moves to Stem Iran Arms Flow to Yemen”
American official says Tehran is trying to supply surface-to-air missiles
http://www.wsj.com/articles/u-s-wants-to-block-iran-from-arming-yemens-houthi-rebels-1428868461
Keep in mind that the Houthi are being bombed mercilessly by the ISAS loving Saudis.
Hmmm... so the U.S. Navy is now the mercenary fleet for the House of Saud!
Disgusting!
ISIS
It kills me to say it, but: Hammer:Nail:Impact.