![]() Time and again, the league has shown that it is open to ideas generated by any source or circumstance - or even by new technology - if it believes that the changes will improve the game. Throughout the history of the NFL, the custodians of the game not only have protected its integrity, but also have revised its playing rules to make the contests fairer, safer and more entertaining. Of course, that’s not how professional football is played today. Teams now could use separate players on offense and defense, develop role players within those units and use a player solely as a kicker or other special teams player. The free substitution concept proved too popular, though, and it was brought back in 1949. In 1946, after the war ended, the league reimposed some restrictions. Out of necessity, the league decided in 1943 to let teams substitute players at will, Pro Football Hall of Fame historian Joe Horrigan said. But with most young and fit men drafted into the war, lineups were depleted and constantly in flux. Until the war, the league severely restricted substitutions players were on the field for both offense and defense and received no coaching from the bench. Football, like the rest of society, was forever changed by World War II.
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