Everybody should read & study this. Neither the SLS or Various Commercial Crew efforts have the shuttle capabilities. SLS will be cancelled due to costs. When CC efforts are manned, accidents will likely occur & end effort since manned spaceflight requires greater resources than CC has. The Nelson plan for Commercial Space Shuttle is the only way to regain our manned capability. Other approaches are unaffordable. If this fails, HSF for USA is over for a long time. Soyuz is an accident waiting to occur as capsules are more dangerous than runway landers. Soyuz does not meet NASA manned rating requirements. For more info, read nasaproblems.com.
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