Maj. Steven Clough adjusts some trial lenses on a Guyanese girl. U.S. Air Force Maj. Steven Clough, an optometrist from the 310th Aerospace Medicine Flight, adjusts some trial lenses on a Guyanese girl at the Timehri Primary School in Georgetown, Guyana, on Aug 12, 2009. Airmen are deployed in support of New Horizons Guyana a joint mission sponsored by the U.S. Southern Command. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 363558-K-PPL02-138.jpg Photo Gallery