Command battlecruiser

The command battlecruiser was a command division-oriented battlecruiser starship classification introduced in the early 25th century to the fleets of the Alpha Quadrant Alliance by the Starfleet Corps of Engineers. 

History and specifications
Following the end of the Federation-Klingon War of 2405-2410 and the advent of the Alpha Quadrant Alliance formed between the United Federation of Planets, the Klingon Empire and the Romulan Republic, joint operations were prioritized by Starfleet. Based on after-action reports by its captains, Starfleet Command had the SCE develop the command battlecruiser at the San Francisco Fleet Yards.

The Allied militaries Starfleet, the Klingon Defense Force and the Romulan Republican Force developed three modular command battlecruiser starship classes each. The command battlecruiser was designed to function as mobile command center. Its advanced communications array was capable of relaying battle-critical information instantaneously. In addition, command battlecruisers were equipped with a technology allowing them to inspire Allied crews to improve combat performance.

All nine command battlecruiser starship classes were tier 6 vessels. Commanding officers required a minimum rank of vice admiral or its KDF/RRF equivalents, respectively, to attain command of such a ship. 

Starfleet command battlecruiser variants

 * Federation: •  •

Klingon command battlecruiser variants

 * Klingon Empire: •  •

Romulan Republic command warbird variants

 * Romulan Republic: •  •