In the documentary, how was the video of the Pacific War and the battle between Japanese and American aircraft carriers filmed?

On the Pacific battlefield, both sides have war correspondents, who have recorded many war scenes with cameras and video cameras. Comparatively speaking, there are more journalists in the US military. At the same time, in the American army, many people also have cameras, and many private photos were exposed after the war. In some major operations, American pilots are responsible for shooting battle scenes, such as the sinking of the Yamato.