what is the military unit whose command structures are 215th brigade royal field artillery and 215th brigade royal field artillery ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_commandStructure dbr_215th_Brigade_Royal_Field_Artillery sep_dot var_uri dbo_commandStructure dbr_215th_Brigade_Royal_Field_Artillery sep_dot var_uri a dbo_MilitaryUnit brack_close