We did have engine ignition on the #DeltaIVHeavy. ABORT called shortly after that. @ulalaunchconfirms all engines are shutdown & safed. Recycling to T-4mins and HOLDING. This doesn't mean we'll try again tonight. It is standard to recycle to T-4mins and holding mark. #NROL71

— Chris G - NSF (@ChrisG_NSF) December 9, 2018