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
Officer Corps of the Royal Navy appointed to sea command. Officer Corps of the Royal Navy The officer corps of the Royal Navy is the cadre of personnel holding a commission from the sovereign appointing them in a position of authority in the Royal Navy. There are three main routes of entry to the officer corps; direct entry, professional entry and the upper yardman scheme. Direct entrants are recruited as civilians and undertake a full course of training to become employable. Professional entrants are individuals who have qualified professionally in the civilian environment and their employment in the Royal Navy will use these qualifications. These are