Role of American Carriers
None of the three U.S. Pacific Fleet aircraft carriers were in Pearl Harbor when the attack came. This has been alleged by some to be evidence of advance knowledge of the attack by those in charge of their disposition; the carriers were supposedly away so as to save them (the most valuable ships) from attack.
In fact, the two carriers then operating with the Pacific Fleet, Enterprise and Lexington, were on missions to deliver fighters to Wake and Midway Islands, which were intended in part to protect the route used by planes (including B-17s) bound for the Philippines. (The third, Saratoga, was in routine refit in Puget Sound, at the Bremerton shipyard.) At the time of the attack, Enterprise was about 200 mi (170 nmi; 320 km) west of Pearl Harbor, heading back. In fact, Enterprise had been scheduled to be back on December 6, but was delayed by weather. A new arrival estimate put her arrival at Pearl around 07:00, almost an hour before the attack, but she was also unable to make that schedule.
Furthermore, at the time, aircraft carriers were classified as fleet scouting elements, and hence relatively expendable. They were not capital ships. The most important vessels in naval planning even as late as Pearl Harbor were battleships (per the Mahan doctrine followed by both the U.S. and Japanese navies at the time). Carriers became the Navy's most important ships only following the attack.
At the time, naval establishments all over the world regarded battleships, not carriers, as the most powerful and significant elements of naval power. Had the U.S. wanted to preserve its key assets from attack, it would almost certainly have focused on protecting battleships. It was the attack on Pearl Harbor itself that first helped vault the carrier ahead of the battleship in importance. The attack demonstrated the carrier's unprecedented ability to attack the enemy at a great distance, with great force and surprise. The U.S. would turn this ability against Japan. Elimination of battleships from the Pacific Fleet forced the Americans to rely on carriers for offensive operations.
Read more about this topic: Pearl Harbor Advance-knowledge Conspiracy Theory
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