There's "so little being done about what we are protesting about," the soccer star wrote in an Instagram story.
The committee will attempt to root all political gestures out of the 2020 Games in Tokyo.
USOPC will honor Tommie Smith and John Carlos months after giving probation to fencer Imboden and hammer thrower Gwen Berry, who protested at the Pan Am Games.
The U.S. Olympic and Paralympic Committee warned that the U.S. athletes could "face more serious sanctions for any additional breach" of its code of conduct.
Race Imboden took a knee during a gold medal-winning ceremony at the Pan American Games after reading a social media post from his mom.
Fencer Race Imboden took a knee and hammer thrower Gwen Berry raised her first during their medals ceremonies.