The rank, which is non-supervisory, was introduced in 2000 to replace junior technician (although junior technicians promoted before this date retain their rank). The rank badge is a three-bladed propeller inside a circle. From March 2005, SACs in technical trades who had attained the Operational Performance Standard were promoted to SAC(T). This rank was introduced to distinguish airmen trained to work unsupervised from those who were not.