Hundreds of Iranian Revolutionary Guard personnel are on the ground in Lebanon fighting Israel, security sources say. “I have no doubt whatsoever that they are there and operating some of the equipment,” an Arab diplomatic source said Tuesday. Another foreign source, based in Washington, said the Revolutionary Guard contingent in Lebanon is based in Beirut and in the Bekaa Valley. He said the troops usually number a few dozen, but that the size of the force increased in connection with the recent hostilities. The sources said the Iranians had directly operated a radar-guided C–802 missile that Iran acquired from China and that hit an Israeli navy missile boat off the coast of Lebanon on Friday, killing four sailors. The Revolutionary Guard’s mission includes keeping custody of Zalzal medium-range missiles and unmanned drones.