For the Republic of Korea (i.e., South Korea), it would be the Chairman of the Joint Chiefs of Staff, General Han Min-Goo, ROKA (Republic of Korea Army).
For the ironically-named Democratic Peoples Republic of Korea (i.e., North Korea), it would be the Minister of Peoples Armed Forces, Vice Marshall Kim Yong-Chun.
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The President is the Commander in Chief. Highest Rank of the Military.
The president.
Not necessarily.
The highest ranking officer in the Army is the Army Chief of Staff. The current Army Chief of Staff is General Martin Dempsey.
Lightoller was the second officer on board the Titanic. He was the highest ranking officer to survive the disaster.
The US Attorney General is the highest ranking officer of the US Department of Justice, aside from the President of the US.
The Army Chief of Staff is the highest ranking officer in the peacetime Army. The highest raning NCO is the Sergeant Major of the Army.
In most structured armies it is the rank of 'Field Marshal'.
petty officer first class
Colonel Marian McGovern
Vice Chief of Staff.