Mitchell spent seven years in the military before leaving to pursue a civilian career.
Fox Theatre, Woodruff Arts Center are proposed as possible sites for the tournament draw, while Mercedes-Benz Stadium could host matches.
News helicopter footage showed dozens of firefighters scouring the debris, with a group appearing to use a saw to cut through the wreckage.
Manna From Above President James Watson said the number of families seeking help has tripled over the past year.
Gwinnett County holds its annual Veterans Day Ceremony at the Fallen Heroes Memorial on the grounds of the Gwinnett Justice and Administration Center.