Airman 1st Class Samantha Barnett and Amanda Joyce, 28th Medical Operations Squadron public health technicians, place a mosquito trap in a tree near Heritage Lake at Ellsworth Air Force Base, S.D., Sept. 2, 2014. The trap emits carbon dioxide and light to attract mosquitoes into the net to be analyzed and tested for diseases and viruses. (U.S. Air Force photo by Senior Airman Anania Tekurio/Released)