Rolls-Royce has recently developed a new aero-derivative gas turbine for Naval Warship Applications; - the Trent based MT30 has been delivered for both US Navy DD(X) Integrated Power System (IPS) Engineering Development Model (EDM) generator set and Littoral Combat Ship (LCS) mechanical drive applications. The MT30 generator set for the DD(X) EDM land based demonstrator has run successfully in the US Navy’s facility in Philadelphia. The MT30 mechanical drive gas turbine module (GTM) will begin testing in the first Lockheed Martin LCS vessel, USS Freedom, in early 2007. This paper will describe the MT30 powerplant architecture, heritage and design features and will describe some of the major technical challenges overcome during the development and qualification programs. Initial experiences of the engine in its two applications will be described, together with future plans.