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  1. In the United States, commander is a military rank that is also sometimes used as a military billet title—the designation of someone who manages living quarters or a base—depending on the branch of service.

  2. Lieutenant Commander (also hyphenated lieutenant-commander and abbreviated Lt Cdr, LtCdr., LCDR, or LCdr) is a commissioned officer rank in many navies. The rank is superior to a lieutenant and subordinate to a commander.

  3. The president of the United States (POTUS) is the head of state and head of government of the United States of America. The president directs the executive branch of the federal government and is the commander-in-chief of the United States Armed Forces.