An Air Force Titan 4A rocket is to launch a classified spy satellite for the National Reconnaissance Office on July 19. Liftoff from Space Launch Complex-4 East at Vandenberg Air Force Base, Calif. is planned during an unclassified launch period of 1:00 to 5:00 a.m. EDT (0500-0900 GMT). The exact launch time is not expected to be released in advance by the Air Force for national security reasons.