United States troops suffer casualties in Battle of Saipan during World War II

The video highlights the tireless efforts of medical personnel during wartime to save lives, showcasing their dedication and efficiency. It also honors the bravery of Marines who sacrificed their lives for victory, with some being buried at sea by their comrades.

What does the phrase 'with coal and tireless efficiency' imply about the efforts made?

Describe the final resting place of the Marines as mentioned in the text.