The UNSC Damocles destroyer is an older design that specializes in anti-ship duties. It is armed with missile launchers and multiple lasers for anti-ship duties. Like other first generation designs, range is limited.
Finding pictures for escort ships was rather difficult. They only appear near the end of the show's run, and even then, only for very brief moments. This is my interpretation of some of the escort ships. The smallest one is the Connestoga escort. My concept is this is a first generation UNSC ship designed for close escort duty. It has limited range, however, is heavily armed. It is gradually being phased out for the second generation modular ships, however, is still useful in protecting the JFK carriers from other ships.