 Complete the following phrase:  The 10th Princess Marys Own Gurkha Rifles, abbreviated to 10 GR, was originally a rifle regiment of the British Indian Army. The regiment was first formed in 1890, taking its lineage from a police unit and over the course of its existence it had a number of changes in designation and composition. It took part in a number of campaigns on the Indian frontiers during the 19th and early 20th centuries, before fighting in the First World War, the Third Anglo-Afghan War and the Second World War. Following Indias independence in 1947, the regiment was one of four Gurkha regiments to be transferred to the British Army. In the 1960s it was active in the Malayan Emergency and 