Raymond Randle, environmental health technician, Fort Bliss Environmental Health, attaches a warning sing to a mosquito trap urging people not to disturb the equipment during his daily rounds as part of the mosquito surveillance program at Fort Bliss, Texas, to prevent the spread of West Nile virus, Oct. 10. Each week the surveillance team sets more than 20 traps to ensure they are accurately tracking the mosquito population. (Photo by U.S. Army Sgt. Jonathan W. Thomas, 16th Mobile Public Affairs Detachment)