 Complete the following phrase:  After Aden, he was promoted to command 11th Armoured Brigade in the British Army of the Rhine, a post he held from 1968 until 1970, and then attended the Royal College of Defence Studies in 1971. In 1972, he was appointed major-general and seconded to Oman, where he acted as Commander of the Sultans Armed Forces. The new Sultan, Qaboos bin Said, had been trained at Sandhurst and served in the British Army, and as part of the revitalisation of his forces during the 