Iranian military personnel place a national flag on a submarine during the "Velayat-90" navy exercises in the Strait of Hormuz in southern Iran on January 3, 2012, the End day of ten-day war games. Iran's military warned one of the US navy's biggest aircraft carriers to keep away from the Gulf, in an escalating showdown over Tehran's nuclear drive that could pitch into armed confrontation. AFP PHOTO/JAMEJAMONLINE/EBRAHIM NOROOZI (Photo credit should read EBRAHIM NOROOZI/AFP/Getty Images)
