context: German ski instructor Christian Diestl (Marlon Brando) is hopeful that Adolf Hitler will bring new prosperity to Germany, so when war breaks out he joins the army as a lieutenant. Dissatisfied with police duty in Paris, he requests to be transferred and is assigned to the front in North Africa. He sees what the war has done to his captain (Maximilian Schell) and the captain's wife (May Britt), and he is sickened by their behavior.
  Michael Whiteacre (Dean Martin) and Noah Ackerman (Montgomery Clift) befriend each other during their U.S. Army draft physical examination and attend basic training together.They are then stationed in London. Michael is in show business and romantically involved with socialite Margaret Freemantle (Barbara Rush) who, coincidentally, in 1938 dated Christian in the Bavarian Alps where she spent her skiing vacation. She was upset by his Nazi beliefs and deserted him on New Year's Eve to return to Michael.
  Noah, who is Jewish and employed as a junior department store clerk, attends a party Michael throws, where he meets Hope Plowman (Hope Lange). She falls in love with him and introduces her fiancÃ© to her provincial father, who doesn't like Jews but has never met one. After a chat with Noah, the father approves of the marriage.
  In the service, a commanding officer and some of the tough guys in his company try to bully Noah and demonstrate their bigotry. Noah gains the respect of the enlisted men by standing up to them in a series of fist fights, even though he's much smaller and often badly hurt. Authorities however discover Noah's deprived situation, and court-martial his officer.
  Each of these soldiers comes to view the war differently. Christian is conflicted, hating what the war has done to his fellow Germans, but unable to escape from his role in it. He despises what his fellow soldiers have done in the name of the Fatherland but is determined to fulfill his duty to the end. While visiting his seriously wounded captain in a hospital, he unwittingly brings him a sharp weapon, and later learns from the captain's attractive and seductive wife that he had committed suicide there.
  Michael spends most of the war on a safe easy job, nowhere near any real fighting, thanks to his Broadway fame. He finally decides to join the fighting after Margaret shames him into it. However By pulling strings, he soon rejoins his old outfit on the front in the war's final days, a bit too late to matter.
  Noah simply does his duty to the best of his ability, hoping to live through the horrors of war and get home safely to his wife and their new baby. He has a heroic moment where he risks his own life by swimming across a river to save a frightened fellow soldier, one who was especially prejudiced against him in boot camp. Meanwhile Christian discovers the reality of the Nazi regime when he stumbles upon a concentration camp filled with Jews, and hearing the commander tell of the exterminations. Shortly afterwards, the camp is liberated by American forces including Michael and Noah.The mayor (John Banner) of a nearby town offers working parties of his constituents, anticipating media attention. However, he is rudely rebuffed by Whiteacre and Ackerman's company commander, Captain Green (Arthur Franz), when an imprisoned rabbi asks Green for permission to hold a religious service, and the mayor protests.
  Seeing how Ackerman is affected by the camp, Green instructs him to take a walk and sends Whiteacre with him. Shocked and disgusted, the two GIs wander away from the camp. Nearby, dazed, tired, and hungry Christian hides with his weapon, but then screams in rage, breaking his MP 40 apart. The noise draws Michael and Noah, and upon seeing the German, Michael shoots Christian. The two Americans silently watch Christian die, and then quietly walk back towards camp.
  The final scene shows Ackerman emerging from the same subway station through which he left home to the war. As Hope notices him, she lifts up their daughter for him to see, and he then ascends the stairs to his family.
question: Who plays Michael whiteacre?
answer: Dean Martin