Rolls-Royce Holdings plc (LSE:RR.) is considering the sale of its commercial marine business as part of a restructuring of the company into three core units. The announcement came as part of a restructuring of the aero-engine maker into civil aerospace, defence and power systems units, with naval marine and nuclear submarines consolidated into defence and civil nuclear into power systems. This would enable the company to respond more quickly to the needs of its customers, both in the wide body civil aviation market and in defence, as well as to reduce costs.