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
Future of the Royal Navy although many programmes were reduced in scale. This has led to the replacement of smaller and more numerous units with fewer, but larger, units. The main examples of this are the replacement of twelve Type 42 destroyers with six Type 45s and the replacement of the three 20,000 tonne s with two 70,600 tonne "Queen Elizabeth"-class aircraft carriers. There are, as of November 2018, 13 Royal Navy ships and submarines under construction (A further 5 planned): Four s (boats 4-7), one "Dreadnought"-class ballistic missile submarine (boat 1 of 4), one "Queen Elizabeth"-class aircraft carrier (ship 2 of 2), one Type