The Reserve Sustainment Command (RSC) is a functional command within the United States Army Reserve (USAR). It provides sustainment support to U.S. Army and joint forces in various operations, both at home and abroad. This command consists of multiple units such as the 377th Theater Sustainment Command and the 81st Regional Support Command, among others. Their primary roles include logistics, maintenance, and transportation services, ensuring the continuous operation of military activities by providing essential resources and capabilities. The RSC is a critical component of the U.S. Army’s overall readiness and mission success in times of peace or war.