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Tearjerker: Mobile Suit Victory Gundam
About halfway through the series, Uso and Marbet have been captured and are in a cell together. Having lost people near and dear to him, and dealing with the stresses of killing enemy pilots in space, Uso just breaks down and bawls. He stops being a Gundam hero and spends a few seconds being a scared little boy - just before the guards come to take him away again.