Evolution of Federation Heavy Cruisers

USS MacArthur Class Command Cruiser (Phase-III Constitution Class)

USS Cassini class Deep Space Galaxy Exploration Vessel

USS Porter Class Heavy Destroyer

USS Excalibur Class Advanced Cruiser (Phase-I Constitution Upgrade)

USS Soyuz class Border Frigate

USS Pathfinder class Stellar Topography Ship

Star Trek Classic Universe 2nd Chart

Starfleet Ships of the LIne Circa 2099 to 2170 (WIP)