Dozens of dolphins and sea lions trained to detect and apprehend waterborne attackers could be sent to patrol a military base in Washington state, the Navy said Monday. The base is home to submarines, ships and laboratories and is potentially vulnerable to attack by terrorist swimmers and scuba divers. Several options are under consideration, but the preferred plan would be to send as many as 30 California sea lions and Atlantic Bottlenose dolphins from the Navy's Marine Mammal Program, based in San Diego. Dolphins ... are trained to detect underwater mines; they were sent to do this in the Iraqi harbor of Umm Qasr in 2003. Sea lions can carry in their mouths special cuffs attached to long ropes. If the animal finds a rogue swimmer, it can clamp the cuff around the person's leg. The individual can then be reeled in for questioning. The last time the animals were used operationally in San Diego was in 1996, when they patrolled the bay during the Republican National Convention. The Navy has been training marine mammals since the 1960s and keeps about 100 dolphins and sea lions. Most are in San Diego, but about 20 are deployed at Naval Submarine Base Kings Bay, Ga. The Navy is seeking public comment for an environmental impact statement on the proposal.