Sub-lieutenant is a military rank. It is normally a junior officer rank. In many navies, a sub-lieutenant is a naval commissioned or subordinate officer, ranking below a lieutenant. In the Royal Navy (RN) the rank of sub-lieutenant is equivalent to the rank of lieutenant in the British Army and of flying officer in the Royal Air Force (RAF). An RN sub-lieutenant ranks above an Army second lieutenant or an RAF pilot officer. The NATO rank code is OF-1 (senior).
Sub-lieutenant is a military rank. It is normally a junior officer rank. In many navies, a sub-lieutenant is a naval commissioned or subordinate officer, ranking below a lieutenant. In the Royal Navy (RN) the rank of sub-lieutenant is equivalent to the rank of lieutenant in the British Army and of flying officer in the Royal Air Force (RAF). An RN sub-lieutenant ranks above an Army second lieutenant or an RAF pilot officer. In some armies, sub-lieutenant is the lowest officer rank. However in Brazil it is the highest non-commissioned rank, and in Spain it is the second highest non-commissioned rank. The NATO rank code is OF-1 (senior).