American Samoa, Guam, the Commonwealth of the Northern Mariana Islands, the Commonwealth of Puerto Rico, the Virgin Islands of the United States, and any other territory or possession of the United States. (19) Supply chain The term supply chain means a supply chain for a critical good or service. (20) Tribal government The term Tribal government means Indian Tribes, Alaska Native Tribal entities, and Native Hawaiian communities. (21) Under Secretary The term Under Secretary means the Under Secretary of the Office of Supply Chain Resiliency and Crisis Response appointed pursuant to subsection (c).