National Security Space Launch at a Crossroads, Congressional Research Service
"Transitioning away from the RD-180 to a domestic U.S. alternative would likely involve technical, program, and schedule risk. A combination of factors over the next several years, as a worst-case scenario, could leave the United States in a situation where some of its national security space payloads would not have a certified launcher available. Even with a smooth, on- schedule transition away from the RD-180 to an alternative engine or launch vehicle, the performance and reliability record achieved with the RD-180 to date would not likely be replicated until well beyond 2030 because the RD-180 has had 68 consecutive successful civil, commercial, and NSS launches since 2000."
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