After reading World War II at Sea: A Global History you won’t accept media reports of military success uncritically. Some examples:
The Americans, too, inflated their achievement in the Coral Sea. Headlines in the New York Times insisted that American bombers had sunk no fewer than seventeen Japanese warships, including “the certain destruction of two aircraft carriers, one heavy cruiser, and six destroyers.” The papers were initially silent, however, about American losses, reporting only that they were “comparatively light.” In fact, American losses in the Coral Sea were heavier than those of the Japanese, and the loss of the Lexington in particular, representing as it did one-quarter of the nation’s available strike force in the Pacific, was especially worrisome. At the moment, however, the public was hungry for good news, and the Navy Department did not discourage the national celebration.
The Battle of Savo Island was a humiliating defeat for the Allies. With the exception of Pearl Harbor, it was the worst defeat in the history of the United States Navy. It was so bad that, like the Japanese authorities after Midway, the American government kept the outcome an official secret. Based on the official navy briefings, the New York Times reported on August 18: “An attempt by Japanese warships to hamper our landing operations … was thwarted. The Japanese surface force was intercepted by our warships and compelled to retreat before it could take under fire our transports and cargo vessels.” While technically accurate, it was also deliberately misleading.
When there was an actual success to report, of course, the stories were more accurate (even then, however, missteps that wasted lives tended to be omitted).
Maybe we think that we’re great at war because our government and media tell us that things are going our way even when we’re losing?
See also the Vietnam War.