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The Nevada class, comprising USS Nevada and USS Oklahoma, were the first to adopt the so-called all-or-nothing armour scheme, planning on shielding just the machinery and magazine spaces and leave the forward and after end of the ships unarmed so as to save weight and maximize armour thickness where it mattered. Both ships were launched in 1914 and commissioned two years later, Oklahoma differing from her sister by having old vertical triple expansion steam engines, as opposed to Nevada's new geared turbines, a novelty for the time. Being the geared turbine an untested system (having just introduced direct-drive ones 3 years earlier with the commissioning of USS Florida), it was preferred to revert to the old engines for the second battleship just in case something went wrong with the new systems. Also the Nevada class introduced oil-fired boilers into the US Navy, while older classes had coal-fired ones with some capable of oil spraying to have a more efficient combustion. Both ships were present during the attack on Pearl Harbor, Nevada getting underway but having to be beached to prevent her sinking in the channel, and Oklahoma capsizing in Battleship Row.