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There have been many NFL teams throughout the history of the league, and each team has made numerous changes to its uniform during the course of its existence.Other People Are ReadingHistoryWholesale NFL Jerseys of NFL HelmetsThe History of NFL UniformsPrint this article 1920s and 1930sMany teams changed their uniform on a yearly basis. Helmets were not mandatory until the 1930s, and many players did not wear them until that time.