Air commodore is never shortened to Commodore, which is a rank in various naval forces. Air commodore is a one-star rank and the most junior air officer rank, being immediately senior to group captain and immediately subordinate to air vice-marshal. It has a NATO ranking code of OF-6 and is equivalent to a commodore in the Royal Navy or a brigadier in the British Army or the Royal Marines. Unlike these two ranks, however, it has always been a substantive rank. Additionally, air commodores have always been considered to be air officers whilst Royal Navy commodores have not since the Napoleonic Wars
History of the Royal Navy Trafalgar consolidated the United Kingdom's advantage over other European maritime powers, but Nelson was killed during the battle. By concentrating its military resources in the navy, Britain could both defend itself and project its power across the oceans as well as threaten rivals' ocean trading routes. Britain therefore needed to maintain only a relatively small, highly mobile, professional army that sailed to where it was needed, and was supported by the navy with bombardment, movement, supplies and reinforcement. The Navy could cut off enemies' sea-borne supplies, as with Napoleon's army in Egypt. Theoretically, the highest commands of the Royal Navy