San Francisco 49ers quarterback Colin Kaepernick continued his protest against police brutality by kneeling during the National Anthem at a preseason game Thursday night in San Diego, prompting boos from the crowd. Having sat during the anthem in the previous three preseason games, Kaepernick vowed to continue his protest until “significant change” is made to fight racial inequality, despite a major backlash from some of his fans. “Yes, I’ll continue to sit,” he said earlier this week. “I’m going to continue to stand with the people that are being oppressed. To me this is something that has to change. When there’s significant change and I feel like that flag represents what it’s supposed to represent, this country is representing people the way that it’s supposed to, I’ll stand.” Kaepernick’s protest Thursday night coincided with “Salute the Military Night,” an event that saw 240 sailors, Marines, and soldiers hold up a U.S. flag and retired Navy SEALs perform a pre-game parachute jump.