Austal Limited is engaged in design, manufacture and support of high performance aluminum vessels. The company operates in three business segments based on location of the production facilities, related sales regions and types of activity: USA, Australian Operations (AO), Philippines Shipyard Operations (PSO) and Other/Unallocated. The USA segment manufactures performance aluminum defense vehicles for the United States Navy. The AO business segment manufactures high performance aluminium defence vessels for markets worldwide, excluding the USA. The PSO business segment manufactures high performance aluminium commercial vessels for markets worldwide, excluding the USA. The Other/Unallocated segment consists of items and associated assets and liabilities are not allocated to operating segments as they are not considered part of the core operations of any segment.