<page_title> List of USA satellites </page_title> <section_title> List </section_title> <table> <cell> USA-206 <col_header> Number </col_header> </cell> <cell> GPS IIR-21 (IIRM-8) <col_header> Other designations </col_header> </cell> </table>
GPS IIR-21's USA designation is USA-206.