ULA readies Atlas V for launch of NROL-79 reconnaissance satellite

After enduring several delays – most recently from an issue with the second stage of its Atlas V launch vehicle – United Launch Alliance (ULA) is set to launch the classified NROL-79 mission. Liftoff is planned for Wednesday, March 1, 2017, at about 9:50 a.m. PST (12:50 p.m. EST / 17:50 GMT) from Space Launch Complex 3 at Vandenberg Air Force Base in California. According to Spaceflight Now, the exact duration of the launch window is classified, but the opportunity is expected to close by 10:30 a.m. PST. More

(Source: SpaceFlight Insider - Feb 28)