US Air Force (USAF) SENIOR AIRMAN (SRA) Cristopher Davis, 820th RED HORSE (Rapid Engineer Deployable Heavy Operational Repair Squadron Engineers) Squadron, grinds the cement base for a cinder block wall as he helps to build a combined clinic and rehabilitation center in Sophia, Georgetown (South), Guyana, as part of a Operation NEW HORIZONS 2004. This operation is a four-month joint service training exercise being held in Guyana by elements of the US Southern Command (USSOUTHCOM) and the Guyana Defense Force (GDF), and it involves combined teams of US and GDF military personnel working on several construction projects and two Medical Readiness Training Exercises (MEDRETE)