The anomaly was detected during a routine mission assurance check.
The Air Force announcement that it is paying ULA $449.8 million for three Delta 4 Heavy launches is only half the story.
NROL-68 is the second of three missions awarded to ULA under the Launch Vehicle Production Services contract.
WGS-10 was the second to last mission for the Delta 4 medium.
A NASA mission to travel closer to the sun than any previous spacecraft is on its way after a successful launch from Cape Canaveral Aug. 12.
The Air Force expects a replacement for the Delta 4 Heavy rocket will be ready by 2023, with one of several vehicles under development able to take its place.
The Delta 4 carrying the Wideband Global Satcom 9 satellite lifted off at 8:18 EDT.
The launch was scheduled for March 8, carrying WGS-9, the Air Force’s next Wideband Global Satcom satellite.
A United Launch Alliance Delta 4 rocket carrying two space surveillance satellites for the U.S. Air Force lifted off early this morning from Cape Canaveral Air Force Station in Florida.
Friday's briefing starts with United Launch Alliance delaying until Saturday the launch of a classified payload for the National Reconnaissance Office
Fourteen members of Congress from California ask the Defense Department to examine the company's decisions to retire its Delta 4 rocket and to drop Aerojet Rocketdyne as its solid-rocket booster provider.
The United States, Russia and Japan conducted separate, successful satellite launches March 25 during an unplanned seven-hour triple header.
That launch, valued at $389 million, will also use a Star-48 upper-stage motor provided by Orbital ATK.