Delta 4

SV02 was launched on the final Delta IV Medium rocket.

The Interim Cryogenic Propulsion Stage used on Block 1 SLS is based on the second stage of the Delta IV, which has been out of production for years and has no remaining upper stages available for repurposing.

The Space Force has relied on SpaceX’s Falcon Heavy rocket since the retirement of ULA's Delta IV Heavy last year.

SLC-37 was originally built in the 1960s for launching the Saturn I rocket and was later modified for use with United Launch Alliance's Delta 4 rocket.

Modification of Space Launch Complex 37 is expected to begin immediately after the decommissioning of the Delta IV infrastructure.

The retirement of the Delta IV Heavy marked a significant change in the U.S. National Security Space Launch architecture.

The last active launch from Space Launch Complex 37 occurred on April 9, 2024, with the final Delta IV Heavy lifting off carrying a classified payload for the National Reconnaissance Office.

The decision follows the retirement of the United Launch Alliance Delta IV Heavy, which previously occupied Space Launch Complex 37.

The Delta IV Heavy's departure from Space Launch Complex 37 concluded a 60-year lineage of the Delta family.

ICPS is based on the United Launch Alliance's Delta IV's Delta Cryogenic Second Stage.

SLC-6 was originally built for the Manned Orbiting Laboratory program, later modified for the space shuttle, and later modified again to launch Delta IV rockets.

The Space Force awarded SpaceX access to SLC-6, also known as Slick Six, in 2023 after the final launch of United Launch Alliance’s Delta 4 from the site.

Slick-6 (SLC-6) remained mothballed for two decades before being modified to support Delta IV Heavy launches in the 2000s.

The Overhead Persistent Infrared (OPIR) Battlespace Awareness Center (OBAC) at Buckley Space Force Base provides near-real-time OPIR data exploitation products to Space Delta 4 operators and other users from the Mission Control Station.

The final Delta IV Heavy rocket launched on 2024-04-09 at 12:53 p.m. EDT from Space Launch Complex-37 at Cape Canaveral Space Force Station, Florida.

The Delta IV Heavy rocket launched 12 missions delivering national security payloads for the National Reconnaissance Office.

The first Delta IV launch, carrying Eutelsat’s W5 commercial satellite, took place on 2002-11-20.

Each of the three Delta IV Heavy common booster core RS-68A engines delivers 319,896 kg (312.3 kilo-Newtons) of thrust at sea level.