noun
supreme commander; commander-in-chief
Refers to the highest-ranking officer in overall command of a military force or operation.
彼は連合軍の総指揮官に任命された。
He was appointed supreme commander of the allied forces.
司令官 is a commanding officer, often of a specific unit or base, while 総指揮官 is the overall supreme commander.
Compound of 総 (overall) + 指揮 (command) + 官 (official).