1. Falcon Heavy certified for the National Security Space Launch (NSSL) program 2. Congress agrees to allow ULA and Air Force to continue to use RD-180 until Vulcan is ready for operations 3. In April 2015, ULA announced plans to replace Atlas V and Delta IV with Vulcan 4. New competition, and reliance on Russian-built RD-180, contributing to decision to replace EELVs.
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