WASHINGTON—A Navy report has concluded there were sweeping failures by commanders, crew members, and others that fueled the July 2020 arson fire that destroyed the USS Bonhomme Richard, calling the massive five-day blaze in San Diego preventable and unacceptable. While one sailor has been charged with setting the fire, the more than 400-page report, obtained by The Associated Press, lists three dozen officers and sailors whose failings either directly led to the ship’s loss or contributed to it. The findings detailed widespread lapses in training, coordination, communication, fire preparedness, equipment maintenance, and overall command and control. “Although the fire was started by an act of arson, the ship was lost due to an inability to extinguish the fire,” the report said, concluding that “repeated failures” by an “inadequately prepared crew” delivered “an ineffective fire response.” It slammed commanders of the amphibious assault ship for poor oversight, and said the main …