Army Capt. Aaron Sanborn injects Staff Sgt. Daniel Ellis during clinical testing for WRAIR's spike ferritin nanoparticle (SpFN) vaccine at the WRAIR Clinical Trials Center. Built on a ferritin platform, the vaccine offers a flexible approach to targeting multiple variants of the virus that causes COVID-19 and potentially other coronaviruses as well. Ellis was the first active duty soldier to take part in the study. (U.S. Army photo by Mike Walters)