He said the amphibious assault ship Boxer took defensive action after the drone closed to within 1,000 yards of the warship.
Army scientists have created a reconnaissance drone that soldiers will be able to fire from their 40mm grenade launchers.
The Defense Department's has recognized a joint urgent operational need for comprehensive counter-drone technology.
Germany said Tuesday it is abandoning plans to install a new airborne reconnaissance system on U.S.-made drones.
The top Pentagon acquisition official said Tuesday that the U.S. military is ramping up its counter-drone effort.
The DoD named the U.S. Army as executive agent for counter-UAS for all the services.
France's armed forces said it had carried out a drone strike for the first time, during operations in Mali.
The Air Force just flew an unmanned aircraft for two days, demonstrating the drone's ability to take off and land by itself.
The U.S. Navy says one of its drones suffered damage during a takeoff attempt that occurred in the Middle East last month.
U.S. Army weapons officials are testing an experimental drone armed with a multi-shot, 40mm grenade launcher.