The 1140th Engineer Battalion traces its lineage to Missouri National Guard infantry formations that were active prior to the Second World War. As the Army restructured to meet new unit requirements, these infantry elements were reorganized and changed into engineer forces and eventually creating the 1140th Engineer Battalion in 1967. During the
Gulf War of 1990–1991, elements of the battalion were mobilized for duty in
Southwest Asia, providing combat engineer support to coalition forces. Soldiers were tasked with constructing and reinforcing defensive positions, improving mobility routes, and maintaining base infrastructure in the area. After the
September 11 terrorist attacks, the 1140th again mobilized throughout the Middle East, with soldiers deploying in support of the
Global War on Terror. Companies and detachments of the battalion served in Iraq during
Operation Iraqi Freedom. They improved roads and helped with the removal of
IED's set up on roadsides. Even after returning home, in the weeks/days after, the unit was sent to help with
Hurricane Katrina, clearing debris. They also helped raise the levee. in the Middle East, providing construction building and support to U.S. and coalition forces across the region The 1140th helped out with major disasters such as the Great Flood of 1993, soldiers of the battalion worked to reinforce levees, assist evacuations, and protect communities from the floodwaters, the Missouri River floods of 2007, 2011, 2017, and 2019, when companies again created and helped levee repair, sandbag operations, and debris clearance. In May 2011, after an EF-5 tornado tore through
Joplin, engineers of the 1140th were among the first National Guard forces on the scene, providing security support and clearing debris from neighborhoods and critical infrastructure. ==Organization==