Commodore (Royal Navy) Commodore (Royal Navy) Commodore (Cdre) is a rank of the Royal Navy above captain and below rear admiral. It has a NATO ranking code of OF-6. The rank is equivalent to brigadier in the British Army and Royal Marines and to air commodore in the Royal Air Force. The rank of commodore was introduced during the 17th century in November 1674 (though not legally established until 1806). In 1684 the navy introduced two classes of commodore, the first known as a "Commodore Distinction" and the other a "Commodore Ordinary"; these would later evolve into commodores first and second class. In
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