United States Army enlisted rank insignia of World War II

The U.S. Army enlisted rank insignia that was used during World War II differs from the current system. The color scheme used for the insignia's chevron design was defined as either silver grey on dark blue, olive drab on dark blue, or khaki on dark blue (as seen in the charts below). This scheme of rank insignia was established by War Department Circular No. 303 on 5 August 1920 and would see two significant changes in 1942. The usage of this style of insignia was ended by Department of the Army Circular No. 202, dated 7 July 1948, which provided for significant changes in both rank and insignia.

Specialist
The rank of Private Specialist, usually just called a Specialist, had the command responsibilities and official insignia of a Private First Class, but also conveyed higher pay depending on the specialty and skill. While the official insignia was just a single chevron, it was not uncommon for commanders to authorize local use of specialist insignia which consisted of one chevron and one to six rockers depending on the pay grade of the specialist (one rocker at Grade 6, six rockers at Grade 1) and a specialty symbol located between the chevron and the first rocker. These were often identical to a specialty symbol which had been authorized for use during World War I.

Technicians
On January 8, 1942, under War Department Circular No. 5, the ranks of Technician Third Grade (T/3), Technician Fourth Grade (T/4), and Technician Fifth Grade (T/5) were created and replaced the existing specialist ranks. Initially, these ranks used the same insignia as the Staff Sergeant, Sergeant, and Corporal, but on September 4, 1942, Change 1 to AR 600-35 added a "T" for "Technician" to the standard chevron design that corresponded with that grade. Despite that, as with the Specialists that they replaced, unofficial insignia using a specialty symbol instead of the T were used in some units.

A technician was generally not addressed as such, but rather as the equivalent line (NCO) rank in its pay grade (T/5 as Corporal; T/4 as Sergeant; T/3 as Sergeant or Staff Sergeant). Officially, a technician did not have the authority to give commands or issue orders but could under combat conditions be placed second in command of a squad by a Sergeant. Unofficially, most units treated them as though they were of the equivalent rank of the same pay grade.

The Technician ranks were removed from the rank system in 1948. The concept was brought back with Specialist ranks of in 1955.

Technical Sergeant
Technical Sergeant was renamed Sergeant First Class in 1948. However, it still survives as an Air Force rank.

First Sergeant
On September 22, 1942, in Change 3, AR 600-35, the rank of First Sergeant (1st Sgt.) was increased from 2nd Grade to 1st Grade in pay. The insignia was changed to add third rocker to match the other 1st Grade rank, Master Sergeant. A hollow lozenge placed in the angle of the chevrons has been the distinguishing indicator of a First Sergeant in the U.S. Army since 1847.

Pay grades
In 1902, the pay grade system was modified as to be numbered in reverse order. During World War II, "1st Grade" signified the highest enlisted grade (Master Sergeant) and downward from there with "7th Grade" indicating the lowest (Private). In 1948, the pay grades were reversed back to the original system with "1st Grade" being the lowest enlisted grade. Starting in 1951, an "E" —which stands for "Enlisted"— was used to represent a pay grade.

Abbreviations
As seen in the comparative chart below, the U.S. Army ranks during World War II were not abbreviated the same as they currently are today having all letters capitalized. Rather, only the first letter was capitalized, followed by the rest of the abbreviated word in the lower case, and a period to indicate it as being an abbreviation. In some cases, two or more letters were capitalized with a slash mark after the first letter to indicate there were more than one word in the full title of the rank. See the comparative chart below.

Comparative chart
Some ranks are not included in the chart for a proper comparison.