what is the military unit whose command structures are 26th marine expeditionary unit and 26th marine expeditionary unit ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_commandStructure dbr_26th_Marine_Expeditionary_Unit sep_dot var_uri dbo_commandStructure dbr_26th_Marine_Expeditionary_Unit sep_dot var_uri a dbo_MilitaryUnit brack_close