Airman 1st Class Natalie Cheng, 90th Medical Operations Squadron physical therapy technician, donates blood during a United Blood Services drive on F.E. Warren Air Force Base, Wyo., June 24, 2014. For more information on how to donate, visit http://www.bloodhero.com/ or call 638-3326. Another blood drive on F.E. Warren is scheduled for August 1, 2014. (U.S. Air Force photo by Airman 1st Class Jason Wiese)