went with neither. todays theater commanders come from the ranks of any of the eligible services, including the coast guard (speaking for U.S.)
the logistic, personnel, and political considerations for any of the branches is so considerable that (for the most part) only extremely compitent leaders emerge at the top.
historically without doubt the most difficult was ADMIRAL - for evidence let's look back at the discussion on empires. It took a great deal of determination to make an overseas occupation succeed in the past, few countries made it happen for an extended period of time. We can look at most any country and find "great" generals, only in a select few are their admirals successful enough to get equivelant press.
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