. "Operation Barrel Roll" . "Operation Barrel Roll" . . . "''Barrel Roll''" . . . . "Failure to interdict theHo Chi Minh Trail" . . "U.S.: 131 aircraft" . . "American military involvement in Laos" . . . . . . "Operation Beer Barrel" . . "Pathet Lao" . . "Barrel Roll" . . . . . . . . . . . "Barrel Roll area" . . . "bombed by US forces" . . "BARREL ROLL" . . . . . . . . . . . "Strategic US failure" . . "BARREL ROLL Strike missions" . . . . "Operation ''Barrel Roll''" . . . . . . . "1964-12-14" . "Ho Chi Minh Trail" . .