US Navy recruiting poster, 1941
75 Years Ago—Mar. 15, 1943: US Navy establishes numbered fleet system; fleets in the Pacific assigned odd numbers (Third Fleet in South Pacific, Fifth Fleet in Central Pacific, and Seventh Fleet in Southwest Pacific) and those in the Atlantic even numbers (Second Fleet in Atlantic, Fourth Fleet in South Atlantic, Eighth Fleet in North Africa, and Twelfth Fleet in Europe).
Royal Navy launches first X-class midget submarines.
