The 3d Sustainment Command (Expeditionary) is an American military unit. It derives its lineage from the 3rd Logistical Command, which was activated in Japan on 19 September 1950 for service in Korea. In garrison, the 3d Sustainment Command (Expeditionary) provides command and control (Training and Readiness Authority - TRA) of two sustainment brigades and one transportation company as well as administrative support for an engineer battalion. The 3d ESC also mentors other ESCs and sustainment brigades as they seek to improve their capabilities and/or prepare to deploy. Meanwhile, the headquarters is constantly working to prepare itself to deploy and provide command and control, sustainment and distribution management anywhere, in any environment, against any adversary.