You can find USCGA Police on 171.2375 and campus security which is handles the checkpoints at the gates and along the water primarily on 171.3375 . Both frequencies are CSQ.
You need to be very close to the USCGA to hear anything, you can't even pick it up in most of New London/Waterford/Groton. There is a decent amount of chatter on Security, much of the Police frequency, which has very little chatter is first responders on campus.
USCGA was running medical ops through 171.2375 PL 151.c, and they were then handled by NLFD, Wtfd and L&M on the Wtfd trunk system. I don't think Wtfd was ever actually on scene, I know they were cancelled at least twice. I believe the first responders are EMT cadets and during the Graduation USCG Corpsmen.
In general they show up on the same channel as police.