Lt. Col. John Blackburn examines a Nicaraguan volunteer policeman's eyes March 19 at a makeshift optometry clinic at Collegio San Gregorio. Inside the local school, 836 Nicaraguan patients were given free medical, dental and optometry care during a Medical Readiness Training Exercise as part of New Horizons-Nicaragua 2007. Colonel Blackburn is an optometrist with the California Air National Guard's 144th Medical Group. (U.S. Air Force photo/Staff Sgt. Jason T. Bailey)