Maj. Jason Finley, medical operations officer with the Kentucky National Guard's 41st Civil Support Team, scans crowds entering Churchill Downs for the 141st Kentucky Derby in Louisville, Ky., May 2, 2015. Finley worked as a member of the Joint Emergency Services Unit to detect and identify any potential chemical, biological, radiological and nuclear threats for the Derby. (Photo by: Staff Sgt. David Bolton, Public Affairs Specialist, 133rd Mobile Public Affairs Detachment, Kentucky Army National Guard)