High Quality Content by WIKIPEDIA articles! The Nevada class battleships were the United States Navy`s first battleship design equipped with triple gun turrets (the Colorado class would be the last to carry twin turrets, armed with dual-mounted 16-inch guns), as well as introducing 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. The Nevadas also represented the advance to all fuel oil propulsion. Taken together, the Nevada class represented a considerable evolution in battleship design up to this point in time.