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
Ships of the Royal Navy Ships of the Royal Navy Ships of the Royal Navy is a naval history reference work by J. J. Colledge (1908–1997); it provides brief entries on all recorded ships in commission in the Royal Navy from the 15th century, giving location of constructions, date of launch, tonnage, specification and fate. It was published in two volumes by Greenhill Books. Volume 1, first published in 1969, covers major ships; Volume 2, first published in 1970, covers Navy-built trawlers, drifters, tugs and requisitioned ships including Armed Merchant Cruisers. The book is the standard single-volume reference work on ships of the Royal Navy,