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Viper 591 is a Viper Mark II flown by Louanne "Kat" Katraine. While under the influence of stims, she crashes it into Galactica's landing bay while attempting to land (TRS: "Final Cut").
- This may have been meant to be the same craft as Viper 791, which Kat flies during flight training in the episode "Act of Contrition".
- Like many minor Vipers, the model for 591 is marked as Viper 1104.