ACUFO:

One B-29 made evasive maneuvers inside a cloud, but when the B-29 emerged from it, the ball of fire was following in the same relative position. It seemed 500 yards off, three feet in diameter, and had a phosphorescent orange glow. No wing or fuselage suggesting an aerial bomb or plane was seen. The ball of fire followed the B-29 for several miles and then disappeared just as mysteriously as it had appeared in the dawn light over Fujiyama.

Came 1945, and the Foo Fighters made their appearance in the seas of the Far East-the other side of the globe from the German Rhine-over Japan, and over Truk Lagoon, in mid-Pacific. Crews of U.S. B.29 bombers reported to Intelligence, after missions, that balls of fire, of mysterious types, came up from below their planes over Japan, hovered over the tails of their bombers and winked their lights from red to orange, then back from white to red. Exactly as had happened a few months before on the other side of the globe, over the Rhine! Here, too, in the Far East, the weird balls were inoffensive, just 'nosey' and exploratory.

On one occasion, at night, a B.29 flier rose into a cloud in order to shake off one of these balls of fire. When his plane emerged from the cloudbank, the ball was still following - behind him! He said it looked to be about three and 1uw-ltalf feet wide and glowed with a strange red phos-phorescence. It was spherical, with not a sign of any mechanical appendages such as wings, fins, or fuselage. It followed his bombers for five or six miles, and he lost sight of it as the dawn light rose over the mystic peak of Mount Fujiyama, some 60 miles southerly of Tokyo. Here, it seemed to vanish; for it became invisible, exactly like H. G. Wells' Invisible Man.

At about the same time [1945], a B-29 near Fujiyama tried unsuccessfully to outrun a “ball of fire” that stalked the bomber for several miles. The circular, phosphorescent orange glow, about three feet in diameter, took a position 500 yards behind the B-29. The pilot made evasive maneuvers, heading for the nearest cloud. When the aircraft emerged, the ghostly light tagged along in the same relative position. It disappeared just as mysteriously as it had appeared in the dawn light over Fujiyama. The object's departure was extraordinary. One second it was in view, the next, completely out of sight.

[...] illustrates the difficulty of discerning which is conventional and which is not, when reviewing reports from the Pacific air war.

A situation which is summarized in Jo Chamberlin's December, 1945, article in American Legion magazine...

During the last months of the war the crews of many B-29s over Japan saw what they described as “balls of fire” which followed them, occasionally came up and almost sat on their tails, changed color from orange to red to white and back again, and yet never closed in to attack or crash, suicide-style.

One B-29 made evasive maneuvers inside a cloud, but when the B-29 emerged from it, the ball of fire was following in the same relative position. It seemed 500 yards off, three feet in diameter, and had a phosphorescent orange glow. No wing or fuselage suggesting an aerial bomb or plane was seen. The ball of fire followed the B-29 for several miles and then disappeared just as mysteriously as it had appeared in the dawn light over Fujiyama. Some B-29 crews said they could readily lose the ball of fire by evasive maneuvers, even though the ball kept up with them at top speed on a straight course; other B-29 crews reported just the opposite.