Since the United States handed control of the air war in Libya to NATO in early April, American warplanes have struck at Libyan air defenses about 60 times, and remotely operated drones have fired missiles at Libyan forces about 30 times, according to military officials. The most recent strike from a piloted United States aircraft was on Saturday, and the most recent strike from an American drone was on Wednesday, the officials said. While the Obama administration has regularly acknowledged that American forces have continued to take part in some of the strike sorties, few details about their scope and...