In 1943 Smart was assigned to the 9th Bomber Command in the Middle East, duty for which he was awarded the Distinguished Service Medal. While a colonel with the 9th Bomber Command, Smart conceived of the strategy for the daring World War II bombing raid on the oil refineries at Ploesti, Romania. Smart’s idea called for bombers to fly exceedingly low to bomb the tightly defended refineries, which were believed to be producing one-third of the fuel oil for Nazi Germany.