The Canberra Class LHDs will be the largest and most advanced vessels constructed for the Australian Navy. Two ships, HMAS Canberra and HMAS Adelaide, are being built to transport over 1,100 troops, 100 vehicles, and 12 helicopters. They will replace aging amphibious ships and incorporate modular construction and a CODAG propulsion system. Equipped with advanced combat and weapons systems, the Canberra Class LHDs will provide amphibious assault and air warfare capabilities when commissioned in 2014 and 2015.