Korea: U.N. Planes Hammer At Red Supply Lines. With the truce negotiations bogging down, United Nations planes continue their relentless strafing of Communist positions behind the front lines. 'Mustangs' ride herd on the Reds. Just 400 yards behind the lines, new replacements celebrate mass before the ordeal of battle. Air to air shot of planes. Various aerial view from planes of explosives (?) hitting snowy landscapes. Some anti-aircraft fire is seen from the ground. Meanwhile, a priest leads troops (soldiers) in mass, kneeling in prayer. At least one of the soldiers might not be Catholic because he looks unsure of how to make the sign of the cross. Holy communion (Eucharist).