At that time, the United States was at war with Vietnam. In order to provide them with enough information, the United States built a secret radar station on a mountain in northeastern Laos, Vietnam. This station also needs staff to live, so he also needs some living materials. This task is taken care of by an American helicopter. At that time, Vietnam also discovered this place, so Vietnam decided to attack this secret radar station. If it had not been attacked, it might have caused some danger to Vietnam itself.
So one day, Vietnam sent two planes to bomb the secret radar station, and the task was successfully completed. However, when we returned, we met a trouble, because when we returned, we met a helicopter of an American civil aviation company in the sky, and the plane was going to come and deliver the goods on the same day. As a result, the American plane found a Vietnamese plane ahead, so it took its own ak-47 and fired at the other plane. As a result, it did not expect to sweep away one of the other planes. This is also the only thing in the war that a civil aircraft knocked out the other military aircraft.