Technician fourth grade

Technician Fourth Grade (abbreviated as T/4, TEC4 or TEC-4) was one of three United States Army technician ranks established on January 8, 1942, during World War II. Those who held this rank were often addressed as Sergeant. Technicians possessed specialized skills that were rewarded with a higher pay grade. These skills could be directly related to combat, such as those skills possessed by a tank driver or combat engineer, or skills possessed by those in support functions such as cooks or mechanics. They were non-commissioned officers, as were sergeants but had no command authority. Initially, they shared the same insignia as sergeant, but on September 4, 1942, the three technician ranks were distinguished by a block "T" imprinted below the standard chevrons. Unofficial insignia using a technical specialty symbol instead of the T was used in some units.