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the air force
|Naval officer ranks|
Lieutenant commander (also hyphenated lieutenant-commander and abbreviated LCdr, LCdr. or LCDR) is a
A lieutenant commander is a senior department officer or the
Most Commonwealth and other navies address lieutenant commanders by their full rank or the positions they occupy ("captain" if in command of a vessel). The United States Navy, however, addresses officers by their full rank or the higher grade of the rank. For example, oral communications in formal and informal situations, a lieutenant (junior grade) is abbreviated as "lieutenant," and a lieutenant commander is abbreviated as "commander."