General (or full general to distinguish it from the lower general officer ranks) is the highest rank currently achievable by serving officers of the British Army. The rank can also be held by Royal Marines officers in tri-service posts, for example, General Gordon Messenger the new Vice-Chief of the Defence Staff. It ranks above lieutenant-general and, in the Army, is subordinate to the rank of field marshal, which is now only awarded as an honorary rank. The rank of general has a NATO-code of OF-9, and is a four-star rank. It is equivalent to a full admiral in the Royal Navy or an air chief marshal in the Royal Air Force.