United Launch Alliance’s Atlas 5 rocket made its way back to the pad at Space Launch Complex 41 at Cape Canaveral Space Force Station on Thursday morning for a mission carrying national security mission payloads, collectively codenamed Silentbarker. Liftoff has been rescheduled for at 8:47 a.m. EDT (1247 UTC).

A United Launch Alliance Atlas 5 rocket launched from Cape Canaveral with a classified payload for the National Reconnaissance Office at 5:32 p.m. EST (2232 GMT) Friday. The launcher debuted new Northrop Grumman-built solid rocket boosters.

The announcement was made by Robert Lightfoot, the ULA Lockheed Martin Board Chair, in a statement on Monday. The board now begins a search for his permanent replacement.