Lt. Gen. Alexus Grynkewich, the head of U.S. Air Force Central, speaks at a news conference at the U.S. Embassy in Abu Dhabi, United Arab Emirates Wednesday, Sept. 20. Iran's supplying of bomb-carrying drones to Russia could see Moscow help Tehran's program become more lethal, raising risks across the wider Middle East, the top U.S. Air Force commander in the Middle East said Wednesday. (AP Photo/Jon Gambrell)