SAN VICENTE, EL Salvador -- Airman 1st Class Christopher McDonald welds roof trusses at a clinic here April 21. The clinic is one of the New Horizons exercise projects that will build two new schools and three clinics in areas that were hit by earthquakes. Airman McDonald is assigned to the 28th Civil Engineer Squadron at Ellsworth Air Force Base, S.D. (U.S. Air Force photo by Tech. Sgt. John M. Foster)