It is alleged, but not proven that 2,395 B-17's completed 25 mission tours during World War 2.
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Thousands.
Many flew more missions than that.
B-17 crews had to complete 25 missions before they were rotated back to the United States. If they elected to they could stay on for 5 more missions to complete 30 missions and not be called back to duty but if they left after 25 missions they could be called back again to the war and would have to complete another 25 missions before they went home again.
There were 2 North Carolina class ships completed in the late 30's, 4 South Dakota class ships completed in the early part of WW2, and the 4 Iowa class ships completed in 1943-44... so depending on your exact timeframe, approximately 10 that were completed. Additionally, there were 2 more Iowa class ships that were never completed, and 4+ Montana class ships that were never built (basically enlarged Iowas with an extra turret, lower speed, and thicker armor)
Four Yamato-class Battleships were ordered. Two of which were completed. (Yamato & Musashi). The third (Shinano) was partially-completed, and then converted into an aircraft carrier. The fourth was cancelled and never built.