United Launch Alliance

L3Harris Technologies (via its Aerojet Rocketdyne propulsion capabilities) supplies RL-10 cryogenic upper-stage rocket engines to United Launch Alliance for use on the Vulcan Centaur launch vehicle.

Air Products supplies industrial gases including helium and hydrogen to United Launch Alliance (ULA) for launch vehicle processing and ground operations (ongoing, as leading supplier to commercial and government space programs).

Vivace International Corporation supplies hardware (including propulsion tanks and related components) to United Launch Alliance as a customer for launch vehicle programs.

Blue Origin supplies BE-4 liquid methane/liquid oxygen engines (two per vehicle) for the first stage of ULA's Vulcan Centaur launch vehicle; first flight engines delivered in 2022 with ongoing production and acceptance testing for initial and subsequent launches.

Blue Origin supplies and has delivered multiple BE-4 rocket engines (including the first shipset in 2022 and at least 30 engines total by late 2025) to United Launch Alliance for the Vulcan Centaur launch vehicle under a long-term partnership and teaming arrangement that began with co-development in 2014; Blue Origin also makes BE-4 commercially available.

Northrop Grumman supplies GEM 63 and GEM 63XL solid rocket boosters (up to six per launch) for ULA's Atlas V and Vulcan Centaur vehicles; multi-billion dollar orders including a $2 billion contract tied to Project Kuiper support, with ongoing deliveries.