チャレンジャー号爆発事故
The 1986 Space Shuttle Challenger disaster and 2010 Space Launch System program resulted in renewed proposals for Saturn C-3 derivatives using the Rocketdyne F-1A engines with existing booster cores and tooling (10m - Saturn S-IC stage; 8.4m - Space Shuttle external tank; 5.1m - Delta IV Common Booster Core).