Or, a gear wheel Celeste surmounted by two forge hammers pilewise, handles to base, Gules (Crimson) debruised by a demi-compass rose of the first issuant from a point wavy overall Azure.
That for the regiments and separate battalions of the North Carolina Army National Guard: From a wreath Or and Azure, a hornet's nest hanging from a bough beset with 13 hornets all Proper.
Crimson and light blue are the colors used for Maintenance, the original designation of the unit. The hammers and cogwheel are symbolic of the basic maintenance mission of the Battalion. The unit's location in North Carolina, sometimes call "The Old North State" is suggested by the northern points of the compass rose and its situation upon the curving blue scroll, suggesting a river, further refers to the unit's headquarters at Kinston, North Carolina on the Neuse River.
The crest is that of the North Carolina Army National Guard.
The coat of arms was originally approved for the 690th Maintenance Battalion on 4 February 1998. It was redesignated retroactive to 1 September 2006, for the 690th Support Battalion with the symbolism updated.