"The rank of junior technician is only held by airmen in technical trades and by musicians. Airmen in non-technical trades always progressed directly from senior aircraftman to corporal. Junior technicians are qualified to work alone and supervise untrained airmen working within their area of responsibility. The rank was introduced in 1950 as part of a new grading system for technicians, wearing a single point up chevron. In 1964, when the grading system was abolished, JTs were retained, their badge changing to a four-bladed propeller."@en . . . . "Junior technician"@en . . "The rank of junior technician is only held by airmen in technical trades and by musicians. Airmen in non-technical trades always progressed directly from senior aircraftman to corporal. Junior technicians are qualified to work alone and supervise untrained airmen working within their area of responsibility. The rank was introduced in 1950 as part of a new grading system for technicians, wearing a single point up chevron. In 1964, when the grading system was abolished, JTs were retained, their badge changing to a four-bladed propeller. In 2000 the Royal Air Force changed the rank to Senior Aircraftman (acting technician), SAC(T). In 2005 promotions to the rank of junior technician ceased. However, those previously promoted continue to be at JT rank until they are promoted to Corporal or leave the service. JT is the most senior rank below Corporal and is considered to be equivalent to Lance Corporal in the Army but without the power to discipline junior ranks."@en . . . .