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Lockstep
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<p>In the United States, lockstep marching or simply lockstep is <a href="/facts/Marching/Vr08280b">marching</a> in a very close single <a href="/facts/File_(formation)/BFom50J1">file</a> in such a way that the leg of each person in the file moves in the same way and at the same time as the corresponding leg of the person immediately in front of him, so that their legs stay very close all the time. </p>