Shield
Per bend Argent and Sanguine, in chief a spike of bluebonnet (Lupinus Texensis) slipped and foliated Proper.
Crest
On a wreath of the colors Argent and Sanguine a demi-horse rampant Argent.
Motto
STANDING BY.
Shield
The colors of the shield, white and maroon, are the Army Medical Department colors. The bluebonnet, the Texas State flower, indicates the unit was organized in Texas.
Crest
The 1st Squadron, from which the 15th Medical Battalion descended, was known in the 1st Cavalry Division as the "Mounted Medics," and the horse as the crest is symbolic of that title.
The coat of arms was originally approved for the 1st Medical Squadron on 11 July 1928. It was redesignated for the 15th Medical Battalion on 29 December 1950. It was amended to change the motto from Standing By on 28 September 1976. The insignia was redesignated for the 15th Support Battalion with the symbolism revised on 22 April 1987. It was amended to change the motto back to Standing By on 27 June 1991.