Russia uses the R-7 ICBM for most of its space launches. The advantage of it is that there's no concern on what the weather is like on launch day and R-7 launches never get postponed due to weather. The only ICBMs the USA used for crewed flights were the Atlas for several Mercury missions and the Titan II for the Gemini program. The Saturn V must have been quite strong too obviously, they even launched Apollo 12 during very bad weather. The only ICBM-derived rocket NASA is currently using for (uncrewed) spaceflight is the Atlas V, afaik. Many present-day rockets of NASA are quite weak and launches get postponed due to not very strong winds. Why don't the USA use ICBMs for crewed and other more important flights? They aimed to launch the planned Space Shuttle Dream Chaser on the Altas V but the plans for the crewed Dream Chaser went on hold for some reason.
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as per Russell Borogrove's statement
Why don't the USA use stronger rockets for the more important launches?
user35272