The US Rangers were founded by Major General Lucian Truscott of the US Army, a liaison officer with the British General Staff. In 1942, he submitted a proposal to General George Marshall that an American unit be set up "along the lines of the British Commandos". The original US Rangers trained at the British Commandos centre at Achnacarry Castle. The US Navy SEALs' original formation, the Observer Group, was also trained and influenced by British Commandos. The US Special Forces originated with the First Special Service Force, formed under British Combined Operations. The First Special Service Force was a joint American-Canadian unit and modern Canadian special operations forces also trace their lineage to this unit and through it to British Commandos, despite existing in their modern incarnation only since 2006.