Squadrons using the newly-built Penguin-class fighter are sent to serve aboard Al-Burak-class carriers assigned to the Twelfth Fleet along the Federation/Kzinti border in 2231. (The Starfleet Museum: 23rd-Century Carriers and Fighters)
The 44th Attack Squadron, embarked on USS Tiamat, was the first Penguin unit to see action, in January of 2233 when it destroyed a Kzinti staging area at Monaba. (23rd-Century Carriers and Fighters)
The Twelfth Fleet and Starbase Twelve is featured in the most recent stories of Star Trek: Black Hawk. Starbase Twelve, also known as Starbase Rockford, is on the Cha'ouwian/Federation Border and takes place after the Dominion Wars at the end of the 24th Century.