An unmanned Navy drone slammed into a marsh in eastern Maryland Monday, killing no one and leaving no reported injuries, initial reports said. But the loss of the $176 million plane could be used against President Obama’s drone program in the Middle East. The RQ-4A Global Hawk drone crashed during a routing training test from a nearby naval air station. The U.S. Coast Guard blocked the tributary where it landed from recreational boats as an investigation was launched. The crash, which Navy officials called highly unusual, occurred just after noon local time.