Captain's Log #50 is a special issue, so its supplement is as well! The Captain's Log #50 Supplemental File has 16 pages of information including the publisher's behind the scenes tour of Captain's Log #50, the Captain's Log #49 after action report, an article about workboats, more about the Zosman stealth field, additional rules for the Federation & Empire Romulan Civil War scenario, six "leftover" SSDs for Star Fleet Battles, and the expanded Master Ship Chart for all the ships in Captain's Log #50 including refits.
The SSDs are of 16 interceptor workboats, Klingon power-boosted D5, Klingon collared D5N, Tholian alternate jumbo web charger ship design, and Kzinti old heavy cruiser.