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Chain crew
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===Auxiliary chain crew=== For professional and [[college football]] games, an ''auxiliary chain crew'' operates on the opposite side of the field, supervised by the line judge. Their presence lets players and officials look to either side of the field for information. The auxiliary chain crew also includes a member holding the ''drive start indicator'', which is placed at the beginning of a team's drive and stays there until the team loses possession. This indicator is only used for statistical purposes to calculate the distance of each drive. It looks similar to a "stick" and has an arrow (or occasionally a large "X") that points in the direction the offensive team is going. The NFL eliminated the drive start indicator in [[2018 NFL season|2018]].<ref name=chaininterview/>
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