Vice Admiral Allan Rockwell McCann left no reminiscences that might reveal a deeper sense of his extraordinary service, but naval historian Carl LaVO has filled that void by writing this revealing—and often inspiring—biography. Among McCann’s many accomplishments: Served as liaison officer for the modification of the antiquated O-12 submarine into the privately-leased Nautilus that made the first attempt to sail beneath the Arctic ice shelf in 1931; pioneered the McCann Submarine Rescue Chamber; directed fire from the sub tender Pelias at Japanese aircraft attacking Pearl Harbor; commanded the battleship Iowa during the Battle of Leyte Gulf; was Chief of Staff of the Navy’s 10th Fleet that stymied a last ditch effort to attack North America via U-boats; headed the Navy task force that transported President Truman to the Potsdam conference; and as ComSubPac was aboard the first submarine to navigate under the polar ice in 1947. This book is an overdue appreciation of a significant admiral who has been all but ignored in naval history. Rather, he let the record speak for him. This book is an overdue appreciation of the admiral who has all but been ignored in naval history.