In October 1941, Brigadier Frederick Arthur Montague "Boy" Browning was promoted to major general, named the Commander Parachute and Airborne Troops, and ordered to form a headquarters to develop and train airborne forces. The next unit formed was the 1st Airlanding Brigade on 10 October 1941, by the conversion of the mountain warfare trained 31st Independent Infantry Brigade Group, commanded by Brigadier George Frederick "Hoppy" Hopkinson, later to command the division. The brigade comprised four battalions: the 1st Border Regiment, 2nd South Staffordshire Regiment, 2nd Oxford and Bucks Light Infantry, and the 1st Royal Ulster Rifles. The men who were unsuitable for airborne forces were replaced by volunteers from other units. By the end of the year Browning's command had become the headquarters of 1st Airborne Division.