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 junior ratings in this rig. This is the same as for Officer's No. 3 dress but with the relevant rate insignia and seaman's cap (or beret). Junior rates are only issued with short-sleeve shirts and are not issued with ties. This is divided into 3B (without jersey) and 3C dress (navy-blue jersey worn over the shirt with the shirt collar out). There is no equivalent of 3A dress for junior ratings. Junior ratings, in common with all ranks and rates of the Royal Navy, are currently (2015) in the middle of the process of being issued the new No4. RNPCS