A gold color metal and enamel device 1 1/8 inches (2.86 cm) in height overall consisting of a green laurel branch extending diagonally from lower right with the tip in upper left over a white calumet with bowl to base saltirewise, both supporting in the upper angle a gold lion rampant clasping three arrows with right paw, all extending over a brick red disc with gold center bearing in base a Taeguk in the Korean colors (scarlet and blue).
Brick red and golden yellow (gold) are the colors used for Transportation, the former designation of the unit. Service in World War II, for which the unit was awarded the French Croix de Guerre with Palm, is denoted by the colors scarlet and green of the Croix de Guerre; the laurel branch indicates the Palm; and the lion rampant refers to the coat of arms of Frosinone Province, Italy, where the unit was cited for action at Acquafondata. World War II service in Europe, which included three assault landings, is also signified by the three arrows held by the lion. The organization's Korean War service, for which it received the Republic of Korea Presidential Unit citation, is represented by the Korean Taeguk. The calumet and branch saltirewise over a disc are suggested by the round shield and saltire elements on the state flag of Oklahoma and denote the unit's origin. The large ring around the gold center alludes to tire wheels and the motor transport mission of the predecessor organization.
The distinctive unit insignia was originally approved for the 245th Transportation Battalion on 28 June 1972. It was redesignated effective 1 September 1994, for the 345th Support Battalion with the description and symbolism revised.