ULA calls off launch of triple-core Delta 4-Heavy rocket, will try again Saturday

United Launch Alliance early Thursday delayed the launch of a triple-core Delta 4-Heavy rocket — the largest launcher in the company’s fleet — until Saturday to allow engineers more time to resolve an issue with a ground pneumatics control system. The launch company planned to fire the Delta 4-Heavy rocket into space at 2:12 a.m. EDT (0612 GMT) Thursday from Cape Canaveral with a classified payload for the National Reconnaissance Office, the U.S. government’s spy satellite agency. More

(Source: SpaceFlight Now - Aug 28)