2005 International Special Operations Forces SOF Week Exhibitor Challenge Coin. MacDill Air Force Base Tampa Florida, Commander General Bryan D. Brown, Partners in Intl Security, Advance Planning Briefing to Industry. White Metal with enamel and resin. This pre owned convention exhibitor souvenir is in good condition. There are some scratches on the resin areas and along the edges. Measures approx 2 inches diameter x 1/8 inch thick.