what is the military unit whose command structures are no . 2 group raf and raf second tactical air force ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_commandStructure dbr_No._2_Group_RAF sep_dot var_uri dbo_commandStructure dbr_RAF_Second_Tactical_Air_Force sep_dot var_uri a dbo_MilitaryUnit brack_close