A gold color metal and enamel device 1 1/8 inches (2.86 cm) in height consisting of a pair of gold wings opened and inverted and in front of them placed horizontally with bow at the right a scarlet key its shaft crossed at center by a vertical buff-colored double open-end wrench each end containing a gold hex nut with red center the upper and smaller and between the pinions of the wings, the lower end below the apex of a scarlet chevron and between the ends of a three sectioned gold scroll, two sections curving inward from either side the third section curving across bottom and bearing the words "PROVIDE" at left, "SUSTAIN" at bottom and "MAINTAIN" on the right in blue letters.
Buff and scarlet are the colors used by Support units. The organization's mission is expressed briefly in the words of the motto, "PROVIDE, SUSTAIN, MAINTAIN." The key, a traditional quartermaster symbol, refers to the word PROVIDE; the word SUSTAIN is represented by the chevron or rooftree, a symbol of support and the wrench is for maintenance, alluding to the last word of the motto. The wings in the background refer to the city of Los Angeles (The Angels) where the unit headquarters is located.
The distinctive unit insignia was originally approved for the 311th Support Brigade on 4 November 1970. It was redesignated for the 311th Support Command (Corps) on 15 January 1980. The insignia was redesignated for the 311th Sustainment Command with the description updated on 13 October 2006.