Last year, I got 18 on F=ma and did not get an award on USAPhO.

This year, I got a 20 on F=ma.

According to the USA Physics Team website, "Similar to the International Physics Olympiad, nominally the top 10-12% scorers in USAPhO will receive gold medals, the next 14-16% receive silver medals, the next 20-22% receive bronze medals and the next 24%-26% will receive honorable mentions. The exact cutoff will vary from year to year."

If I do not take USAPhO, this market will be cancelled.