What does the red mean?

[v0031]

A week after Nagasaki, Tokyo had still not surrendered. A third weapon was already on its way and a dozen were to follow.
American military archives reveal that if the Japanese had not surrendered on August 15, 1945, they would have been hit by a third and potentially more powerful atomic bomb just a few days later and then, eventually, an additional barrage of up to 12 further nuclear attacks.
In the spring of 1945, the U.S. Army set up a special target committee to debate key Japanese cities to attack as officials believed their regime had already made it perfectly clear they were not willing to surrender at any price.
Confidential reports added that “even after two atom bombs, they preferred to fight on till they are all dead. Death or glory.
American officials or Japanese officials?

[Donerail]

American officials. It's a fairly ambiguous sentence, though.

"In the spring of 1945, the U.S. Army set up a special target committee to debate key Japanese cities to attack, as [Army] officials believed [the Japanese] regime had already made it perfectly clear they were not willing to surrender at any price."