Or, a saltire Gules (Scarlet), an escutcheon per pale Argent and Gules, a surveyor's plumb bob Azure detailed of the third within the open end of a spade iron counterchanged.
That for the regiments and separate battalions of the Alabama Army National Guard: From a wreath Or and Gules, a slip of cotton plant with full bursting boll, Proper.
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Scarlet and white are the colors used for Engineer organizations, the unit's original designation. The surveyor's plumb bob, spade iron and saltire (symbolic of the crossbeams used in construction) allude to the former basic mission of the battalion. The red saltire also appears on the Alabama State Flag, the home area of the unit.
The crest is that of the Alabama Army National Guard.
The coat of arms was originally approved for the 145th Engineer Battalion on 24 December 1997. It was redesignated effective 30 September 2002, for the 145th Chemical Battalion, Alabama Army National Guard.