The United States Army Evaluation Center Distinctive Unit Insignia, commonly referred to as a “unit crest” or by the initialism DUI, was approved with an effective date of 1 October 1999, the same date that the U.S. Army’s Operational Test and Evaluation Command was redesignated as the Army Test and Evaluation Command, the Center’s parent organization. Focal point of the insignia is the set of scales in its center, the perfect emblem to represent the Center’s mission of measuring and evaluating with complete objectivity (as evidenced by the scales being displayed in true balance).
A green laurel wreath encircling the insignia is emblematic of honor, integrity, and high standards. The ribbon upon which the motto “Understanding” is written stands for the weapons and defense systems brought before the Center for evaluation, while the blue background in the center emphasizes the truth. “Understanding” also reflects the awareness that a complete awareness and comprehension of the acquisition process is required for the Center to fulfill its mission.
You can find guidance on wear of the DUI is found in DA Pamphlet 670-1, Section 21-22, "Distinctive unit insignia" and 21–3(d) and (e), "Beret" and "Garrison Cap," respectively.
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The redesignation of the Army’s Operational Test and Evaluation Command to Army Test and Evaluation Command led to the creation of three major subcommands which included the Army Evaluation Center (AEC), formed through the combination of the Operational Evaluation Command and the Evaluation Analysis Center. Originally based in Alexandria, Virginia, the AEC was forced to relocate to Aberdeen Proving Grounds per the recommendation of the 2005 Base Realignment and Closure Commission. Despite this obstacle, the AEC was tapped for an Army Superior Unit Award in April 2009 for its outstanding service between 2 February 2004 and 1 June 2006.