United Launch Alliance's veteran workhorse. Russian RD-180 first stage, Centaur upper stage. Final flights through 2028 for remaining NRO and commercial contracts. Successor: ULA Vulcan.
| Operator | ULA |
|---|---|
| Country | US |
| First flight | 2002 |
| Status | Retiring (final flights 2026-2028) |
| Class | Medium-lift expendable |
| Primary pads | SLC-41 Cape Canaveral, SLC-3E Vandenberg |