The T.S.S. Midway is a Hastings-Class Battlecarrier. Designed to be a multi-purpose all-role commandship, the Hastings-Class vessels carry a wing of fighters, the firepower of a battleship and can transport an entire infantry company of colonial marines.
The most expensive warship in humanity's arsenal, the Midway is the only Hastings-class battlecarrier operational when the war breaks out, and she is still undergoing her shakedown cruise. The lead ship of the class, the T.S.S. Hastings, vanished the first time the FTL drive was activated and was never seen again.
Two sister ships, the Trafalgar and the Marathon, are under construction. All Hastings-Class Battlecarriers are named after famous battles.
Here, the Midway is being escorted by two Firestorm-Class escort frigates and a patrol flight of Crossbow fighters.