It depends on the country and the year.
There was no "USA" team that year because of the boycott.
1926
The U.S. Olympic team for running in 1980 was notably affected by the boycott of the Moscow Games due to political tensions. Athletes who qualified, such as distance runners Frank Shorter and Joan Benoit, were unable to compete. While the team was selected, the boycott meant that many of the qualified athletes never had the opportunity to represent the U.S. at the Olympics that year.
It was 1996 that the Wheel off Fortune sponsored the US Olympic Team
They did not win a medal.
1986
2012 was her first year on the olympic gymnastics team in which she competed in 4 events
45
2011
That was the 2000 Games in Sydney where the U.S. team won the gold medal.
1964