Lofty joined the Parachute Regiment in 1958. He applied for service with the Special Air Service Regiment in 1959 and set a record as the youngest person ever to pass selection at the age of 18. He served with 22 SAS for 26 years and saw active service worldwide, in every theatre of operations and special operations required of the British Army between 1959 and 1985.
Amongst other things, Lofty was Sergeant Major, B Squadron 22 SAS, Sergeant Major 22 SAS Training Wing, Head of Operational Research 22 SAS, he set up the SP Team (Counter Hi-Jack) and set up the SAS Counter-Terrorist Team as well as training the first members of the US Green Berets who then returned to the USA to form the famous Delta Force (US Special Forces). Lofty also ran the famed SAS Selection Course, deciding who was fit to join the Regiment.