On 13 June 1952, two PA ANG pilots were flying an RB-29 over the Soviet Union when they were shot down by a pair of MiG-15s. The RB-29 was never recovered, having crashed in the waters off of Vladivostok, Russia. The Pennsylvanian families of the Air Guard pilots were told they had simply "vanished" in a weather-reconnaissance flight near Japan. It wasn't until the fall of the Soviet Union and the opening of communist archives that the relatives found out the truth in 1993. It is unknown as to whether any of the pilots or crew of this aircraft were captured by the Soviets at that time.