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The '''''Nevada'' class battleships''' carried the [[United States Navy]]'s first triple gun turrets, a feature that would be seen in all but one of its future [[battleship]] designs (the [[Colorado class battleship|''Colorado'' class]] would be the last to carry twin turrets, armed with dual-mounted 16" guns). Even more significantly, they introduced the so-called "all or nothing" armor scheme, in which protection of vital areas was optimized against heavy caliber guns, leaving other parts of the ship essentially unprotected. This reflected a growing awareness that improved gunfire controls would drive battleship engagements out to long ranges, where smaller guns would only serve to defend against torpedo and air attack. Thus, armor intended to counter those guns would be, at best, a waste of valuable weight. The basic concept of the ''Nevada''s' armor system was ultimately adopted by all naval powers. The ships marked the end (in the USN) of the midships turret, which had traditionally proven to be problematic because of the necessity of having the midships magazine surrounded by extremely hot boilers and pressurized steam lines. Instead, Turrets I and IV had an additional weapon added, becoming triples instead of doubles and allowing the same amount of firepower with one fewer turret.
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