21 round Rolling Airframe Missile launcher. Image credit Darkone via Wikipedia.
Since RAM is going on the FF(X) and could easily go on either the National Security Cutters and the Offshore Patrol Cutters, Thought I would pass along this short article about the system.
Chuck Hill's CG Blog 
Now . . . if you only had a non-rotating (fixed array faced) AESA radar to detect, track, and provide Fire Control . . . you would have a mini-Aegis!