A midshipman is an officer cadet or a commissioned officer of the lowest rank, in the Royal Navy, United States Navy, and many Commonwealth navies. In the 17th century, a midshipman was a rating for an experienced seaman, and the word derives from the area aboard a ship, amidships, either where the original rating worked on the ship, or where he was berthed. Beginning in the 18th century, a commissioned officer candidate was rated as a midshipman, and the seaman rating began to slowly die out. By the Napoleonic era (1793–1815), a midshipman was an apprentice officer who had previously served at least three years as a volunteer, officer's servant or able seaman, and was roughly equivalent to a present day petty officer in rank and responsibilities. During the 19th century, changes in the training of naval officers in both the Royal Navy and the United States Navy led to the replacement of apprenticeship aboard ships with formal schooling in a naval college. Midshipman began to mean an officer cadet at a naval college. Trainees now spent around four years in a college and two years at sea prior to promotion to commissioned officer rank. Between the mid-19th and mid-20th centuries, time at sea declined to less than a year as the entry age was increased from 12 to 18. (Full article...)