Delta IV WGS-10

Launch Webcast

More details to come

Launch Updates

Solid rocket motors attached to Delta IV rocket

Feb. 11, 2019 -- The four solid rocket motors (SRMs) that will help power the Delta IV launch vehicle off the pad in March have been mated to the first stage.

Photo credit: ULA

Each of the Graphite Epoxy Motors measures 60 inches in diameter and is 53 feet in length. They were delivered to Space Launch Complex-37 and sequentially attached over the last week.

Known as GEM-60s, all four boosters will be ignited at the launch pad and deliver a combined 1.1 million pounds of thrust to augment the more than 705,000 pounds of thrust produced by the RS-68A main engine to power the Delta IV rocket skyward.

The boosters are manufactured by Northrop Grumman, and 62 have flown to date on Delta IV rockets.

Photo credit: ULA

The SRM mating completes the initial buildup of the launch vehicle. The two cryogenic stages were integrated at the nearby Horizontal Integration Facility (HIF) and rolled out to the launch pad on Jan. 24.

The encapsulated WGS-10 payload will be hoisted atop the Delta IV later in the launch campaign to complete the 218-foot-tall rocket.

Liftoff remains on track for March 13.

Delta IV rocket transported to launch pad for next mission

Jan. 26, 2019 -- Less than a week after United Launch Alliance successfully launched its Delta IV Heavy rocket from the U.S. West Coast, a smaller variant of the rocket family has rolled out to the East Coast launch pad for liftoff in March.

Photo credit: ULA

The Delta IV Medium+ (5,4) rocket is scheduled for launch from Cape Canaveral Air Force Station on March 13 to deliver the Air Force’s tenth Wideband Global SATCOM (WGS-10) military communications satellite into orbit.

The common booster core first stage and the Delta Cryogenic Second Stage arrived in July, 2018 at Cape Canaveral Air Force Station from our factory in Decatur, Alabama, sailing to Florida aboard the Mariner cargo vessel. Technicians then mated the two stages together in the Horizontal Integration Facility (HIF) and completed rigorous testing.

The 170-foot-long rocket was moved from the HIF to Space Launch Complex-37 on Thursday, Jan. 24, riding a 36-wheel, diesel-powered transporter down the road and up the ramp to the launch pad.

Photo credit: ULA

After reaching the pad, cradle-like pallets holding the rocket were secured to the Fixed Pad Erector on the pad’s surface. Two hydraulic pistons rotated the orange and white rocket vertically onto the pad’s launch table on Friday, Jan. 25, achieving the Launch Vehicle on Stand, or LVOS, pre-launch milestone.

Coming up next in the launch campaign, the four solid rocket boosters (SRBs) will be attached to the first stage.

This will mark ULA’s 133rd mission, our 51st for the Air Force, the 39th Delta IV rocket to launch and the 8th in the Medium+ (5,4) configuration with a five-meter-diameter upper stage and four SRBs.

Delta IV to Launch WGS-10

Rocket: Delta IV Medium+ (5,4)
Mission: 10th Wideband Global SATCOM (WGS-10)
Launch Date: Wednesday, March 13, 2019
Launch Time: More details to come
Launch Broadcast: More details to come
Launch Location: Space Launch Complex-37, Cape Canaveral Air Force Station, Florida

Mission Information: The 10th Wideband Global SATCOM (WGS-10) satellite, the fourth Block II follow-on satellite, supports communications links in the X-band and Ka-band spectra. While Block I and II satellites can instantaneously filter and downlink up to 4.410 GHz, WGS-10 can filter and downlink up to 8.088 GHz of bandwidth. Depending on the mix of ground terminals, data rates and modulation and coding schemes employed, a single WGS satellite can support data transmission rates over 6 Gbps, and WGS-10 with its advanced digital channelizer may support over 11 Gbps.

Launch Notes: WGS-10 will be the eighth flight of the Delta IV in the Medium+ (5,4) configuration; all launches in this configuration have delivered WGS missions to orbit. This mission also will be the 39th launch of the Delta IV since its inaugural launch in 2002.

Launch Updates: To keep up to speed with updates to the launch countdown, dial the ULA launch hotline at 1-877-852-4321 or join the conversation at, and; hashtags #DeltaIV #WGS-10.


Go Delta Go WGS-10!


Delta IV NROL-71

The Delta IV rocket

United Launch Alliance’s Delta IV rocket has served the nation’s high-priority U.S. Air Force and National Reconnaissance Office space programs with distinction since entering service in 2002. The vehicle also launched NASA’s Orion capsule on its first orbital test flight and sent the Parker Solar Probe on its journey to become the fastest robot in history while surfing through the sun’s atmosphere. Having flown 38 missions in a variety of configurations ranging from medium-lift to heavy-lifter, the Delta IV continues the legacy of the Delta rocket family that dates to 1960.

WGS-10 will launch aboard a Delta IV Medium+ (5.4) rocket features one hydrogen-fueled common booster core, four solid rocket motors and a Delta Cryogenic Second Stage. The payload is protected during atmospheric ascent by a composite payload fairing.

Space Launch Complex 37

Space Launch Complex 37, the East Coast home of the Delta IV rocket at Cape Canaveral Air Force Station in Florida, is a classic launch pad design with a Fixed Umbilical Tower (FUT) and a Mobile Service Tower (MST). The core stages of the rocket are assembled in the nearby Horizontal Integration Facility, then rolled to the pad for attachment of the payload, final testing and the countdown. The mobile gantry is retracted to unveil the rocket several hours before liftoff.

NASA constructed SLC-37 in the 1960s for uncrewed test flights in the Apollo-Saturn program. The pad was rejuvenated in an extensive overhaul to support the Delta IV starting in the late 1990s.