Certifying Cells Army Col. Deydre Teyhen, commander of Walter Reed Army Institute of Research, certifies cell starting material from liquid nitrogen storage signifying the initiation of the institution’s COVID-19 vaccine material in Silver Spring, Md., Aug. 26, 2020. The institute is supporting COVID-19 response efforts. SHARE: Download: Full Size (1.47 MB) Tags: Army, Vaccine, coronavirus Credit: Shawn Fury, Army VIRIN: 200826-O-IL961-573.JPG Photo Gallery