This is not a reenactment; no computer graphics, no simulations. Original documentary of the battles fought to retake the Marianas. Also includes the assault on Angaur, an island just west of New Guinea, and a Navy film of the Battle of Midway.
From PDVideo3’s channel – This 1944 Office of War information film depicts the successful but costly invasion of the Japanese held islands of Guam, Tinian, and Saipan, in the Marianas Island group during World War II.
As a work of the U.S. government it is in the public domain.