Screenshot via United Launch Alliance
The 30th Space Wing at Vandenberg Air Force Base published a media advisory Wednesday night announcing the initial delay of the Atlas V launch. A second push was issued some time later with the rescheduled launch now expected Aug. 4.
An "uprange instrumentation issue" kept the rocket Earth-bound, however no issues were reported with the Atlas V vehicle or the NROL-36 space vehicle.
The launch window is now set for Aug 4 at 12:13 a.m., and a live simulcast will begin on the ULA website about 20 minutes prior to launch. ULA is a Lockheed Martin and Boeing joint venture providing "access to space" for U.S. government missions.