Chief Master Sgt. Steve Milhollin helps a Guyana Defense Force engineer make block measurements. U.S. Air Force Chief Master Sgt. Steve Milhollin, a chief engineer, helps a Guyana Defense Force engineer make block measurements to ensure the joints in a concrete wall stay in line in Georgetown, Guyana, on July 7, 2009. U.S. airmen are participating in New Horizons Guyana, a U.S. Southern Command-sponsored annual exercise designed to strengthen ties with partner nations in Central and South America through combined quality-of-life improvement projects. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 162298-C-LVQ40-705.jpg Photo Gallery