Raisman and Douglas were both part of the gold medal winning team, dubbed the Fierce Five, at the 2012 London Olympics where Douglas won gold in the all-around and Raisman won gold on the floor event and bronze on the balance beam.
Biles won gold at the 2013 World Championships in the individual all-around and on floor exercise. She also won silver on vault and bronze on balance beam.
Biles and Kocian were part of the 2014 World Championship gold medal winning team. Biles additionally won gold in the all-around, on floor exercise, and on balance beam. She also won silver on vault.
Biles, Raisman, Douglas, and Kocian were all part of the 2015 World Championship gold medal winning team. Biles won gold in the all-around and Douglas won the silver. Biles also won gold on floor exercise and balance beam and won bronze on the vault. Kocian won gold on the uneven bars in a four way tie. Thus making Biles the reigning world champion in all-around, floor, and balance beam and Kocian the reigning world co-champion on the uneven bars going into the Olympics. Additionally Biles was the reigning national champion as well.
Aly Raisman, the captain of the Fierce Five, was once again selected as team captain.
Biles was chosen by Team USA to be the flag bearer for the closing ceremonies. She was the first American female gymnast to be given the honor.