The NFL world reacts to Colin Kaepernick's announcement.

Colin Kaepernick made headlines once more on Tuesday. 

The former NFL quarterback's letter to the New York Jets became public after rapper J. Cole made it public. 

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We learned that Kaepernick requested to join the Jets' practice squad in a detailed letter to general manager Joe Douglas. 

Kaepenir's lengthy letter, including reasonings and rationales. 

Kaepernick has not appeared in an NFL game since the 2016 season. The former San Francisco 49ers 

player was vocal in his opposition to police brutality in America. 

He knelt during the National Anthem, which, combined with the uproar in America, 

created an untenable position that eventually led to Kaepernick's resignation from the NFL. 

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