All RAF MRT members are volunteers. RAFMRS team members are known as "M.R. Troops" or just "Troops." Traditionally, team membership is reserved for enlisted men and women; although officers may serve as either Mountain Rescue Team liaison Officers (MRTLO) or as a Troop, NB this is not at all the same thing as being the team leader but simply a mechanism linking the Team to the station's executives. The position of Team Leader is reserved for a senior NCO, generally a seasoned veteran. For some, service on a team is a primary duty, and they are known as the Permanent Staff or PS. For others, it is a part-time activity in addition to their normal RAF trade or branch for which they are granted relief from other normal secondary duties, such as guard duty.