Gules, within an annulet of six mullets Argent a keystone Azure fimbriated of the second and charged with a broadarrow point to chief of the like.
That for the regiments and separate battalions of the Pennsylvania Army National Guard: From a wreath Argent and Gules a lion rampant guardant proper holding in dexter paw a naked scimitar Argent hilted Or on a fess Sable three plates.
Scarlet and white (Silver) are the colors traditionally used by Engineer units. The six stars, symbolizing achievement, represent the unit's participation in six wars, the War of 1812, the Mexican War, the Civil War, the War with Spain, World War I and World War II. The keystone alludes to the state of Pennsylvania, the present home station of the organization. The arrowhead represents the battalion's assault landing at Naples-Foggia during World War II.
The crest is that of the Pennsylvania Army National Guard.
The coat of arms was originally approved for the 337th Support Battalion on 26 October 1995. It was redesignated for the 337th Engineer Battalion on 19 December 1997. It was rescinded on 28 August 2014.