Staff Sgt. Bria Nelson is one of four enlisted men and women announced Friday as dance partners for the president, first lady, vice president and his wife at the Commander in Chief’s Ball. All four served in Iraq or Afghanistan.

President George W. Bush was the first to host the ball to honor U.S. troops and began the tradition of taking a brief spin with one of the military guests. Obama did so as well at his first inauguration. This year Obama is doubling the size of the Commander in Chief’s Ball to about 4,000 guests, most of them enlistees.