"Sine days of World War II, the submarine force has projected an appealing aura to military outsiders. A unique aspect of the submarine community is the intimate relationship between submarines and nuclear power. All submarines in the U.S. Navy are nuclear powered and all submarine officers are nuclear trained. Newly commissioned officers selected for submarines go through a year-long sequence of theoretical and practical training in nuclear power, specifically in the use of the pressurized water reactor used on all the U.S. submarines."