They caught a guy a couple of years ago trying to climb up on one of the Aegis Missle cruisers at the Yard and they came out like a swarm of hornets when he tripped the alarms. They dragged him off and we never heard another word about it.
Interesting thing was a week later, they cut a 15' square hole in the side of the hull of that boat above the waterline and took something large covered in tarps out under armed guard with a 200 yard secured perimeter. They stuffed it in a truck and left with an armed convoy of about a dozen trucks and police escort.