In addition to naval codebreaking that gave Admiral Chester Nimitz advance warning of Japan’s plan of attack, the U.S. fleet benefited from another key technological advance at Midway: radar. The U.S. Naval Research Laboratory (NRL) had developed the first radar system prototype by 1938, and early radar systems were placed aboard carriers and other ships leading up to the Pearl Harbor attack.

At Midway, all three U.S. carriers and some supporting vessels benefited from radar, which allowed them to detect approaching Japanese aircraft at long range and better prepare for their attacks. In contrast, the Japanese ships relied solely on human lookouts, allowing U.S. dive-bombers to remain undetected until virtually the moment they reached attack position.

On May 27, 1942, the USS Yorktown struggled into Pearl Harbor, after traveling 3,000 miles across the Pacific. During the Battle of the Coral Sea, a 551-pound Japanese bomb had hit the Yorktown’s wooden flight deck, smashing through and exploding inside the ship. More than 1,400 repairmen worked around the clock, patching the holes in the Yorktown with steel plates, in order to have it ready for Nimitz at Midway.

After barely 48 hours in Drydock Number One at the Pearl Harbor Navy Yard, the Yorktown steamed out to join the Hornet and Enterprise 325 miles north of Midway, at a predetermined meeting spot known as “Point Luck.” The Yorktown’s presence caught Japan by surprise; they had thought they had disposed of the carrier in the Coral Sea.

Japanese counterattacks from bombers and submarines sank the Yorktown on June 7, 1942, but not before it managed to play a key role in the Allied victory at Midway.

In 1998, the Yorktown was finally located some 16,650 feet under the surface of the Pacific, by a team led by Robert Ballard, the undersea explorer known for discovering another famous wreck: the Titanic.

Best known for his masterful Westerns, and his longtime collaboration with John Wayne, director John Ford was also an officer in the U.S. Naval Reserve, and was tasked with making documentary films for the Navy during World War II.

At Admiral Nimitz’s request, the director was stationed on Midway during the battle, and suffered a “bomb concussion” and gunshot wound during the Japanese raid, according to now-declassified records. U.S. Marines gave Ford first aid, but he “did not leave his station until he had completed his photographic mission.”

Ford’s footage of the battle, and particularly the activities of U.S. B-17s (Flying Fortresses), appeared in The Battle of Midway, which won an Oscar for best documentary that year. Ford went on to lead the photographic unit for the Office of Strategic Services (OSS), the precursor to the CIA, for the remainder of the war.

Over the years, Midway has assumed near-mythic status as the moment fortunes shifted in World War II’s Pacific theater. Its impact has sometimes been attributed to the battle’s devastating impact on the Japanese strike force, which included the loss of four aircraft carriers, nearly 300 planes and as many as 3,000 men, including Japan’s most experienced pilots.

In fact, as historian Evan Mawdsley has pointed out, Japan’s fleet rebounded from the battle relatively quickly: Yamamoto retained his two most modern carriers, Shokaku and Zuikaku, and four smaller carriers that had not accompanied the Kido Butai carrier battle group to Midway. The United States also sustained damaging losses at Midway, and by the time of the Battle of the Santa Cruz Islands in October 1942, Japan was able to assemble a more powerful carrier fleet than the Americans.

Midway did, however, represent the point when the momentum shifted from the Japanese to the Americans in the Pacific. Japan’s Imperial Navy had failed to deliver its knockout blow, and U.S. war production was just ramping up, just as Yamamoto feared.

While Japan had no effective way to replace lost aircraft carriers as the war continued, U.S. shipyards began rolling out new carriers in 1943. It would be those vessels—along with the rest of the nation’s unprecedented wartime production—that would lead the American fleet to victory in the Pacific in 1945.