Capt. Scott Mueller, left, executive officer, 61st Preventative Medicine Detachment, 86th Combat Support Hospital, Fort Campbell, Ky., and Pfc. Garrett Perlinger, right, preventative medicine specialist, also with 61st Preventative Medicine Detachment, start up a motorized sprayer in preparation to spray insecticide around the area where a health clinic is currently being built in Gbediah, Liberia (Sgt. Matt Britton/U.S. Army)