109th Engineer Battalion Unit Crest (Allons Y Faire)

The distinctive unit insignia, also known as the unit crest, for the 109th Engineer Battalion was finalized on October 15, 1968. The design features a red and white shield adorned with a castle, a cactus, and a fleur-de-lis. The castle, derived from the Spanish Campaign Medal, represents the battalion's service during the Philippine Insurrection. The cactus symbolizes its duty along the Mexican border, while the fleur-de-lis signifies service in France during World War I. The unit motto, "Allons Y Faire," meaning "Let's Go Do It," is inscribed across the bottom.

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