Generate a question that has the following answer: ensign for the following movie plot: John Wayne stars as U.S. Navy Captain Rockwell "Rock" Torrey, a divorced "second generation Navy" son of a career Chief Petty Officer. A Naval Academy graduate and career officer, Torrey is removed from command of his heavy cruiser for "throwing away the book" when pursuing the enemy and then being torpedoed by a Japanese submarine after the attack on Pearl Harbor. Torrey's executive officer, Commander (later Captain) Paul Eddington (Kirk Douglas), is a wayward sort who resigned as a naval aviator and returned to the surface navy because of an unhappy marriage. His wife's affairs and drunken escapades have become the talk of Honolulu and her death during the Pearl Harbor attackin the company of an Army Air Corps Officer (Hugh O'Brian), with whom she had a wild fling on a local beachdrives Eddington into a bar brawl with a group of other Army Air Corps officers, a subsequent stint in the Pearl Harbor brig, then exile as the "... officer in charge of piers and warehouses ..." in what he calls a "backwater island purgatory." After months of desk duty in Hawaii and recuperation from a broken arm he suffered in the attack, Torrey begins a romance with divorced Navy Nurse Corps lieutenant Maggie Haynes (Patricia Neal), who tells him that his estranged son Jeremiah (Brandon De Wilde) is now an ensign in the Naval Reserve on active duty, assigned to a PT boat, and dating Maggie's roommate, a Nurse Corps ensign. A brief and strained visit with Jeremiah brings Torrey in on a South Pacific island-hopping offensive codenamed "Skyhook," which is under command of overly cautious Vice Admiral B.T. Broderick (Dana Andrews). On additional information from his BOQ roommate, Commander Egan Powell (Burgess Meredith), a thrice-divorced Hollywood film writer and Naval Reserve intelligence officer recalled to active duty, Torrey guesses that the aim of Skyhook is to capture a strategic island named Levu-Vana, whose central plain would make an ideal airfield site for Army Air Forces Boeing B-17 Flying Fortress squadrons....
A:
What rank does Torrey's estranged son hold?