Byeman said:The "wide body" is the Delta III
Because Japan didn't export items that may have military applications.Archibald said:Why bother with a new cryogenic second stage when a foreign country did the job well ?
CFE said:Any info on the genesis of Delta IV? There's a natural progression from the Delta III upper stage to the Delta IV upper stage. The move to a hydrogen first stage was motivated by a desire to use the same fuels on both stages, but I don't know any more than that.