US Military Chief to Visit Israel Israeli officials say that the U.S. military's top officer will make his first official visit to the Jewish state later this week. Thursday's visit by Joint Chiefs of Staff chairman Gen. Martin Dempsey comes at a time of growing American concern that Israel may be preparing to attack Iran. Israel's Defense Ministry on Sunday confirmed the scheduled visit. It gave no further details, but Iran is likely to top the agenda. The Obama administration is concerned that Iran's recent claim that it is expanding nuclear operations may push Israel closer to a strike. Israel considers a nuclear-armed Iran to be an existential threat, and has repeatedly hinted it might take military action if international sanctions fail to stop Iran's nuclear program, which the U.S., Israel and other Western nations fear is aimed at developing atomic weapons. Tehran denies the charges, and says its nuclear program is for peaceful purposes. Dempsey's visit comes days after an Iranian nuclear scientist was killed in a mysterious car bombing in Tehran. Although there has been no claim of responsibility, Iran has accused the U.S., Israel and Britain of being behind the blast. Last week, President Barack Obama and Israeli Prime Minister Benjamin Netanyahu discussed the Iran situation in a telephone conversation.