A Delta IV Heavy rocket launch was scrubbed for the fourth time out of Vandenberg Air Force Base Wednesday.
The rocket was supposed to launch at 5:49 p.m., but a hydrogen leak was reported within one of the engines about 10 minutes before the scheduled launch.
Launch Alert: we have declared a scrub for today's launch of the #DeltaIVHeavy. We will set up for a 24 hour recycle and the next launch attempt will be 12/20 at 5:31pm PST.
— ULA (@ulalaunch) December 20, 2018
United Launch Alliance says it will attempt the launch again in 24 hours. The launch window opens Thursday at 5:31 p.m.
This was the fourth attempt at launching the rocket.
The launch was scrubbed Tuesday evening because of high ground winds. It was delayed twice before, on December 7 and 8, due to technical issues.
The rocket will deliver a satellite for the National Reconnaissance Office into orbit.