Rank of SGT US Army Air Force jobs WW2
During World War II, the rank of Staff Sergeant (Sgt) in the U.S. Army Air Force was equivalent to an E-6 in the current Army structure. This rank was part of the enlisted ranks and held various responsibilities depending on the specific job and unit. The rank insignia for a Staff Sergeant during this period typically featured a chevron design, which was worn on the left sleeve, point up, and to be olive drab on a dark blue background.
The Staff Sergeant rank was significant as it included command responsibilities and was often the second in command of a squad. While the official insignia was a single chevron, unofficial insignia using a specialty symbol instead of the chevron was used in some units. The concept of the Staff Sergeant rank was established during the war and remained in place until the rank was officially renamed to Sergeant First Class in 1948.
https://en.wikipedia.org/wiki/United_States_Army_enlisted_rank_insignia_of_World_War_II