KTHV-TV investigates the death of an Arkansas National Guard soldier at Fort Chaffee, Arkansas, First Sgt. Michael Gibson. According to military records, his first assignment at the fort when he arrived in June 1998 was to mow a field, "during which he said he ran over something with his mower that created a 'large white cloud.' Within three months, Gibson -- who had never seen a doctor outside routine check-ups for the guard -- was dead of mysterious causes with rashes, respiratory ailments and organ failure." A team of lawyers working for Gibson's widow found that the Army once used Chemical Agent Identification Sets at the fort. The Guard lied about the use of CAIS until the KTHV-TV, although the Guard denies any connection between the white cloud, Gibson's death and CAIS.