A Silver color metal and enamel device 1 1/16 inches (2.70 cm) in height overall consisting of a shield blazoned: Gules a 45 drafting triangle (the 90 angle to base) behind a pair of dividers Argent. Attached below the shield a Silver scroll inscribed "IMPRIMIS" in Red letters.
Scarlet and white are the colors used for the Corps of Engineers. The 45 triangle and the pair of dividers are basic instruments in the making of maps.
The distinctive unit insignia was originally approved for the 30th Engineer Battalion (Topographic) on 1 May 1940. It was authorized for the 30th Engineer Battalion on 7 December 1973.