The Army Field Clerks and the Field Clerks, QMC, were officially designated as warrant officers as a result of Act of Congress, June 4, 1920 and implemented in War Department Bulletin 25 dated June 9, 1920. These warrant officers wore the same uniform as the Army Mine Planter Service warrant officers except they did not wear the sleeve braid. Warrant officers were provided with an insignia of identification on May 12, 1921, which also served as their insignia of grade except warrant officers of the Army Mine Planter Service (Coast Artillery Corps.)

Public Law 230, 77th Congress created two grades of warrant officer on August 21, 1941. On September 4, 1942, Change 1 to AR 600-35 authorized the insignia of grade for warrant officers other than Army Mine Planter Service. The regulation described the insignia for chief warrant officer as a gold bar 3/8 inch (0.95cm) in width and 1 inch (2.54cm) in length with rounded ends, brown enamel on top with a longitudinal center stripe of gold 1/8 inch wide (0.32cm). The insignia for warrant officer junior grade was a gold bar 3/8 inch (0.95cm) wide and 1 inch (2.54cm) long, rounded at the ends with brown enamel on top and a latitudinal center of gold 1/8 (0.32cm) inch wide. War Department Circular 366, November 7, 1942, established a flight officer with the insignia the same, as the warrant officer junior grade except the enamel was blue. The position of Flight Officer was subsequently abolished in 1945.

In Circular 118 dated May 9, 1947, the War Department announced it was seeking legislation to authorize four grades of warrant officers in the Army. The insignia were gold with brown enamel. There were four bars for Chief Warrant Officer, three bars for Senior Warrant Officer, two bars for Warrant Officer First Class, and one bar for Warrant Officer. Samples of the insignia were approved on November 28, 1947 and titles changed to Chief Warrant Officer, Warrant Officer First Class, Warrant Officer Second Class and Warrant Officer Third Class. Legislation establishing the four grades was approved on October 12, 1949; however, the insignia was not implemented.

On August 17, 1954, the Assistant Secretary of Defense advised the Assistant Secretary of the Army that the other military services concurred in new proposed designs. The new designs authorized by AR 670-5 dated September 20, 1956 were as follows:

As a result of a study to improve the warrant officer insignia of grade to make it easier to identify the grade, new insignia was approved by the Chief of Staff Army on June 10, 1970 with an effective date for wear of July 1, 1972. Based on anticipated change in legislation to authorize two additional warrant grades, new insignia for W5 and W6 were also approved by the Chief of Staff in 1970. The insignia was developed but never authorized for wear for W5 and W6. The design of the insignia is as follows:

Master Warrant Officer (W4) insignia was approved by the Chief of Staff on April 8, 1988 to designate certain CWO W4 as master warrants. The appointment to Master Warrant Officer required completion of the Warrant Officer School at Fort Rucker. The first class graduated on December 8, 1988 and class members were authorized to wear the insignia. With passage of the Warrant Officer Management Act on December 5, 1991, the grade of CW5 was established. On March 28, 1991, the Chief of Staff approved continued use of the Master Warrant Officer insignia for Chief Warrant Officer W5.

A request was submitted by the Army Training and Leader Development Panel-Warrant Officer (ATLDP-WO) to wear the CW5 insignia approved in 1970, by the former Chief of Staff, Army, and this request was approved by General Peter J. Schoomaker, The Chief of Staff, on 16 December 2003. The ATLDP-WO also requested authorization for Warrant Officers to wear Branch-specific insignia and colors in lieu of the current Warrant Officer insignia and colors. This request was approved by The Chief of Staff on 24 February 2004. The request was submitted and approved as a first step towards the full integration of Warrant Officer recruiting, accession, education and management into the branch-based systems of the larger officer corps. Additionally, the increasingly joint nature of operations with the Department of Defense and the expanded use of the most senior warrant officers in joint operations validated the need to standardize CW5 rank insignia among all the services that employ them. The effective date for wear of the new CW5 insignia and branch-specific insignia and colors was 9 July 2004 to coincide with the 86th anniversary of the Warrant Officer Corps.