what is the military unit whose command structures are i marine expeditionary force and i marine expeditionary force ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_commandStructure dbr_I_Marine_Expeditionary_Force sep_dot var_uri dbo_commandStructure dbr_I_Marine_Expeditionary_Force sep_dot var_uri a dbo_MilitaryUnit brack_close