US Air Force (USAF) STAFF Sergeant (SSGT) Walter Campbell, performs a levitation illusion with USAF First Lieutenant (1LT) Joni Gronewald as his assistant, during a magic exhibition held inside the Mississippi Coast Coliseum, located in Biloxi, Mississippi (MS). SSGT Campbell and 1LT Gronewald are both members of the USAF premiere entertainment showcase Tops In Blue