The 13th Sustainment Command (Expeditionary)—the "Lucky 13th"—is a U.S. Army modular sustainment command which serves as a forward presence for expeditionary operations for a theater, or in support of a regional combatant commander. Expeditionary sustainment commands (ESC), such as the 13th, synchronize distribution of supplies and services within their operational areas and provides distribution oversight. Formed at Fort Hood, Texas when the 1st Logistics Command deployed to Vietnam, the organization then known the 13th Support Brigade was initially responsible for the training of technical services units to assume combat service support missions in Southeast Asia.