WASHINGTON — United Launch Alliance announced Saturday it is delaying the launch of a Delta 4 rocket carrying a military communications satellite until it can fix a first stage booster issue.

The launch was scheduled for March 8, carrying WGS-9, the Air Force’s next Wideband Global Satcom satellite. However the company said it was delaying the launch due to a “first stage booster issue discovered during standard prelaunch inspections.” The company did not disclose additional details about the problem.

The earliest possible date for the rescheduled launch is March 14, ULA said.

“This additional time will allow the ULA team to ensure all systems are operating nominally prior to launch,” said ULA spokeswoman Lyn Chassagne in a statement. “A new launch date will be released once it is established.”

The Delta 4 is set to take off from Space Launch Complex 37 at Cape Canaveral Air Force Station, Florida.

Speaking to reporters before the launch of the previous satellite, WGS-8, Thomas Becht, the deputy director for MILSATCOM systems at the Air Force’s Space and Missile Systems Center, said WGS features “broadcast, multicast, and point to point connections anytime at anywhere around the world” as well as supporting “X- and Ka- band communications simultaneously and seamlessly connect the two bands.”

It will also feature several spot beams that will aid in cutting through jamming attempts. Starting with WGS-8, the Boeing-built satellites also carry a digital channelizer that provides an estimated 45 percent more bandwidth than older WGS satellites.

Phillip Swarts is the military space reporter for SpaceNews. He previously covered space and advanced technology for Air Force Times, the Justice Department for The Washington Times, and investigative journalism for the Washington Guardian;...