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|Naval officer ranks|
Frigate lieutenant is a rank in some navies, especially those of Spain (Spanish: Alférez de Navío) and Latin America, roughly equivalent to a sub-lieutenant in the Royal Navy or a lieutenant (junior grade) in the US Navy. The French Navy equivalent is a ship-of-the-line ensign (first class) (French: enseigne de vaisseau de première classe).
The NATO rank code is OF-1 (senior)
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