The 39th Engineer Battalion is a unit within the United States Army's Army National Guard. This battalion primarily specializes in engineer duties, which encompass various tasks such as construction, demolition, and road-building operations to ensure the mobility of military forces during both peacetime and war. These responsibilities can extend to bridging rivers, breaching obstacles, building combat outposts, and conducting route clearance operations to remove explosive hazards from roads and pathways. The 39th Engineer Battalion is part of the larger 36th Infantry Division, with its headquarters located in San Antonio, Texas. The battalion's mission is to provide engineer capabilities to support the division, as well as other joint forces when required.