I know how you do it. I was having the same problem, and I just found out how you do it. You have to shoot down all the planes that take off from the Japanese Carriers then you have to bomb the one Carrier. And you have to do it as fast as you can from bombing the Fuel ship or Tanker to shooting down all the planes from the Carriers then bomb the one Carrier and get back to the U.S. Fleet all as fast as you can.