LONDON — The U.S. Olympic Committee's top leaders have been appointed to two key IOC commissions in another sign of the American body's return to the international fold after years of strained relations.

USOC chairman Larry Probst was appointed Friday to the IOC's international relations commission, while USOC CEO Scott Blackmun was placed on the marketing commission.

It's the first time either official has been brought in to serve on one of the International Olympic Committee's advisory commissions.

Probst and Blackmun have worked hard to improve relations with the IOC and reconnect with the international Olympic movement. That comes after Chicago's humiliating first-round loss in the 2009 vote for the 2016 Olympics, which were awarded to Rio de Janeiro.