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
Uniforms of the Royal Navy Volunteer Cadet Corps as well as modern uniforms of Trinity House, the Royal Australian Navy, the Royal New Zealand Navy and Royal Malaysian Navy are virtually identical to RN uniforms, with the exception of flashes at shoulder height and on rank slides. Royal Canadian Navy uniforms are also very similar, though the traditional sailor suit is no longer used and some distinctly Canadian rank insignia and titles are used; i.e., master seaman. Uniform regulations for officers were first issued by Lord Anson in 1748, and remained unchanged for nearly twenty years. Reportedly, the officers themselves advocated its adoption, as they