"Rigorous combat analysis revealed that the survivability improvements afforded by the engine fuses and fire extinguishing features were very small," Kent wrote.

Instead, he called them "a bunch of combat reports" that lack analysis and, in any event, were quickly outdated. They offer a "very narrow perspective" of the war, he said.

Global efforts to combat overfishing are starting to turn the tide to allow some fish stocks to recover, new analysis shows.