The United States completely withdrawing from Afghanistan will make fighting terror more difficult, a top general said on Tuesday. Gen. Frank McKenzie, head of U.S. Central Command, told members of Congress in Washington that conducting counterterrorism requires finding targets, locating them, and eliminating them. “If you’re out of the country, and you don’t have the ecosystem that we have there now, it will be harder to do that. It is not impossible to do that, it will just be harder to do it,” McKenzie said before the House Armed Services Committee. Drones that are sent to kill terrorists, he added, would have to be sent from nearby countries if the United States no longer has a presence in Afghanistan. Instead of getting a drone in place in a matter of minutes, the length of time will be longer. Other options are sending a manned raid or launching a long-range precision …