Scarlet and white are the recognized colors of the Engineer Regiment. The indigo blue field enclosed within and the silver crescent, or gorget, have long symbolized liberty and freedom, originating with Colonel William Moultrie and the defense of Fort Moultrie in 1775. The combination recalls the South Carolina state flag and underscores the brigades home in the Palmetto State. Joined together, the tri-color design signifies the service of South Carolina Engineers during World War I and II and their decorated service in defense of freedom during the Global War on Terror. The crenellated pentagonal border, emblematic of the regiment and of engineering expertise, suggests the fortified battlements historically constructed by Engineers.