A picture released by the official Iranian News Agency (IRNA) shows members of Iran's elite Revolutionary Guard during maneuvers along the Gulf Sea and Sea of Oman. Iran has held the week-long military drill in the Gulf which started on March 31 and will last till April 6.(Xinhua/AFP)

Combination picture from Iranian television shows a test missile fired by Iran in the Persian Gulf on April 1. (Xinhua/Reuters)