
CAMP PENDLETON, Calif. – Once a remote-controlled assault amphibious vehicle trundled ashore here, it stopped and released from its hold a ground robot that continued its way across the wide beach before stopping and launching a quadcopter from its back.The tracked ground robot was accompanied by another wheeled unmanned vehicle topped with a .50 caliber machine gun. At any one time a half-dozen or more unmanned aerial vehicles (UAVs) of varying shapes and sizes flitted overhead. In some cases they…