**Launch date and time are subject to change** A United Launch Alliance Atlas 5 rocket, designated AV-073, will launch the fourth Advanced Extremely High Frequency (AEHF) satellite. Built by Lockheed Martin, this U.S. military spacecraft will provide highly-secure communications. The rocket will fly in the 531 vehicle configuration with a five-meter fairing, three solid rocket boosters and a single-engine Centaur upper stage.
**Delayed from Dec. 15, Jan. 26, May 4, June 22 and June 29.**