170505-N-KV163-155 LOUISVILLE, Ky. (May 5, 2017) Master Chief Sherri Roberts, assigned to the Navy Operational Support Center (NOSC) Louisville, mans the rails during the 143rd Kentucky Derby at Churchill Downs. NOSC Louisville has partnered with Churchill Downs, offering a military presence at the Kentucky Derby, the longest, continuously running sporting event in United States history. (U.S. Navy photo by Mass Communication Specialist 1st Class John Sorensen/Released)