Ahhh, and I needed that hint

What war movie filmed in B&W and in the 1950s--starring Van Johnson as a Lieutenant (for our English Cousisns, that's Leftenant) and for our German Cousins that's Leutnant) in charge of a Platoon of Nisei in the 442nd RCT?

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Lost are only those, who abandon themselves) Hans-Ulrich Rudel.