First responders from around the area are honoring the 19 firefighters who sacrificed their lives over 60 years ago in the Shamrock McKee Refinery Explosion. The memorial service starts at 6:30 p.m. on July 29 at the Moore County Courthouse in Dumas. On July 29, 1956, 19 firefighters rushed into the flames to protect everyone in the Shamrock McKee Refinery Explosion in Moore County. This is the fourth largest firefighter loss of lives in the U.S. for a single fire incident involving industrial or structural fire protection. Dumas Fire Department, Sunray Fire Department and Valero Emergency Response Team will participate in the service.