Because of the limited number of TDS attorneys (even the U.S. Army's largest installation, has only about 10 TDS attorneys), the TDS organization was originally not large enough to have its own unit patch (shoulder sleeve insignia). For 25 years, the TDS "unit patch" was World War II-vintage patch of the Army Service Forces. This patch had come to be designated the Department of the Army Staff Support patch and is worn by Department of the Army field operating agencies, including the U.S. Army Safety Center and the Defense Commissary Agency. In August 2006, however, a distinctive unit patch for TDS was approved for wear. From the Institute of Heraldry's description: "The shield-shaped patch reflects the nature of legal defense work. The sword supporting scales of justice represents the unit's mission to defend soldiers at courts-martial and separations boards; seeking justice for all soldiers. The sword also signifies that Trial Defense Service personnel are soldiers as well as lawyers. The glory, mullet, and the red border are adapted from the Department of the Army Staff Support patch previously authorized for wear by the Trial Defense Service, and provides a historical link to its organizational heritage."