context: In late 1941, Captain Rick Leland (Humphrey Bogart) is court-martialed and discharged from the U.S. Coast Artillery after he is caught stealing. He tries to join the Canadian Army, but is coldly rebuffed. He subsequently boards a Japanese ship, the Genoa Maru, in Halifax, apparently to make his way to China via the Panama Canal to fight for Chiang Kai-shek.
  On board, he meets Canadian Alberta Marlow (Mary Astor) and Dr. Lorenz (Sydney Greenstreet), a professor of sociology who makes no secret of his admiration of the Japanese and is thus not popular in the Philippines, where he resides. Leland, in his turn, makes it clear to Lorenz that he has no loyalty toward his country and would fight for anyone willing to pay him.
  During a stop in New York, Leland, revealed as a secret agent trailing Lorenz, reports to Colonel Hart (Paul Stanton), an undercover Army Intelligence officer. Lorenz is a known enemy spy, but Hart and Leland are uncertain about Marlow. Upon returning to the ship, Leland surprises a Filipino man (Rudy Robles) who is about to shoot Lorenz, thus gaining Lorenz's confidence. Second-generation Japanese-American Joe Totsuiko (Victor Sen Yung) embarks as a passenger. Lorenz attempts to gather details from Leland concerning the military installations guarding the Panama Canal. Meanwhile, Marlow and Leland engage in a light-hearted romance.
  As they arrive in Panama, the captain announces that the ship has been denied passage through the strategically vital canal and will be forced to take a long detour around Cape Horn. Leland, Marlow and Lorenz disembark to wait for another ship. Several crates are unloaded addressed to a Dan Morton at the Bountiful Plantation. Lorenz asks Leland, who was once stationed in the area, to procure up-to-date schedules for the American planes that patrol the canal. Leland meets with his local contact, A. V. Smith (Charles Halton), and convinces him to provide the real schedules, as Lorenz could easily find out if he were given fake ones. The date is December 6, 1941 - the eve of the attack on Pearl Harbor.
  Having delivered the schedules after haggling with Lorenz over their price, Leland is knocked out. He wakes up several hours later and finds out that both Lorenz and Marlow have left the hotel. He immediately calls Smith and warns him to change the patrol schedule, then, on a tip from an informer (Philip Ahn) inside a movie theatre, heads out to the Bountiful Plantation, where he sees a torpedo bomber being prepared. He is captured, however, and brought inside to Lorenz, Marlow, and Totsuiko. Marlow turns out to be the daughter of the plantation's owner, Dan Morton (Monte Blue), a drunk whose weakness was exploited to provide a base for espionage activities. To Leland's relief, Marlow's only stake in the affair is concern for her father.
  Lorenz reveals that they killed Smith before he could have the schedule changed, and that they are planning to torpedo the Panama Canal Locks. After Lorenz leaves for the landing field, Leland overpowers Totsuiko after the latter shoots Morton. Leland makes his way to the field where he takes over a machine gun and shoots down the bomber aircraft, piloted by no less than an Imperial Japanese prince, as it is about to take off. Leland dispatches Lorenz's men in the ensuing firefight. Returning to the house, he finds a defeated Lorenz attempting to commit seppuku, but his nerve fails him and he begs Leland to shoot him in the head. Leland refuses, saying his prisoner has "a date with Army intelligence."
question: When was Lieutenant Rick Leland dishonorably discharged from the United States Army?
answer: In late 1941, Rick Leland was dishonorably discharged.