The US Chairman of Joint Chiefs of Staff General Martin Dempsey, will arrive in Israel on Monday to oversee the largest air defense drill of its kind, which is currently underway.Dempsey will be greeted by a honor guard ceremony in Tel Aviv and will be met by IDF Chief of Staff Lt.-Gen. Benny Gantz.The two military leaders are expected to tour areas where the missile defense drill is being held.Dempsey has warned in the past against a unilateral Israeli strike on Iran's nuclear program sites, saying in August that he did not want to be "complicit" in such an operation.