Colin Kaepernick
In 2016, Kaepernick became a national figure because he knelt on one knee during the United States national anthem, which is being played before every NFL game. He did this to protest police brutality and racism against African Americans in the United States.  At first, Kaepernick sat down while the anthem was played, but a former United States Army Green Beret named Nate Boyer told him to kneel on one knee instead because this is what soldiers do at the graves where dead soldiers are buried and because Boyer thought it was more respectful than sitting down.