Biochemistry Lab Army Maj. Patrick Twomey, chief of the Walter Reed Army Institute of Research Clinical Trials Center, stands next to a fume hood at WRAIR in Silver Spring, Md., May 31, 2017. Most vaccine samples arrive at WRAIR readymade, but others first require some preparatory mixing under a fume hood. DoD photo by Rick Docksai SHARE IMAGE: Download Image: Full Size (0.09 MB) Tags: Malaria, Zika , Walter Reed Army Institute of Research, Soldier, Army, Science and Technology Photo By: Rick Docksai VIRIN: 170531-D-ZZ999-999.JPG Photo Gallery