Orin: The GMG use no capital ships. They aren't a conventional force, that's what people need to realise. GMG is a corporation that accomplishes whatever goals it can with diplomacy and it's connections in the government, corporations and even unlawful factions. What it can't defend from indirectly, it defends directly using one of the best trained and equipped fighter and bomber wings in Sirius. The GMG taught the Blood Dragons how to fight in nebulas as well as supplied them with cash to become a strong enough force to threaten Samura (source: rumours on Kyoto). I believe that stands for something.
The GMG *never* fight head on. They use superior tactics and speed and skills to get things done. Besides, Cruisers and Battleships would get dismantled in the thick clouds of Sigma-13 by quick strikes before they could do any damage, in RP anyways. Ergo, no cruisers, limited gunboats, preferably only Kusari Explorers.