ULA Scrubs Penultimate Delta IV Heavy Launch Attempt from Cape Canaveral.

United Launch Alliance (ULA) has delayed the launch of its Delta 4-Heavy rocket carrying a classified spy satellite for the National Reconnaissance Office (NRO) due to a problem with a ground systems pneumatics valve. The launch has been rescheduled for Thursday, with an 80% chance of favorable conditions. The NRO's Advanced Orion satellites are believed to intercept telephone calls, data transmissions, and other types of communication by U.S. adversaries. ULA is retiring the Delta family of rockets in favor of the new-generation Vulcan launch vehicle, which is scheduled to make its first test flight later this year from Cape Canaveral.