White cells in military training exercises

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White cell has another meaning not covered in the disambiguation page. See https://www.realcleardefense.com/articles/2016/06/08/train_like_you_fight_and_the_command_post_exercise_109427.html

    the “white cell” is the overarching element which includes observers and ensures that the training is conducted properly. The white cell should have complete visibility and incorporates observer feedback on training audience performance, guide the exercise storyline to test key objectives, and ensure the high/low control elements follow the story.