U.S. Army Spc. Jessica Salas, right, a combat medic

U.S. Army Spc. Jessica Salas, right, a combat medic from the 228th Combat Support Hospital observes the on-hand practice by Guatemalan army soldiers from the humanitarian and rescue unit. Guatemalan soldiers needs to properly evaluate and treat a casualty during a medical exchange at the administrative support unit of the humanitarian and rescue unit in Guatemala City, Guatemala, July 14, 2011. This exchange involved personnel from Guatemala and the United States working together to share combat medical tactics, techniques and information.