TEHRAN, IRAN - JANUARY 21: Iranian Revolutionary Guard soldiers play instruments during the funeral of General Mohammad Ali Allahdadi, a Guard commander killed in southern Syria by an Israeli strike, outside the gate of a Guard base on January 21, 2015 in eastern Tehran, Iran. Iran has vowed revenge against Israel with "devastating thunderbolts," after the January 18 strike in the Golan Heights that also killed six Hezbollah commanders including Jihad Mughniyeh, son of the former Hezbollah military commander Imad Mughniyeh. (Photo by Scott Peterson/Getty Images)