A field marshal is the most senior military rank, usually senior to the general officer ranks. It is considered a five-star rank (OF-10) in modern-day armed forces in many countries). The rank of field marshal is the highest attainable rank in the Indian Army, and it is a ceremonial/wartime rank. In the British Army, field marshal has been the highest rank since 1736, and it is a five-star rank with NATO code OF-10). The rank is equivalent to an Admiral of the Fleet in the Royal Navy or a Marshal of the Royal Air Force in the Royal Air Force (RAF)). The insignia of a Field Marshal consists of two crossed batons surrounded by yellow leaves below the Tudor Crown). The rank has been used sporadically throughout its history, and it was vacant during parts of the 18th and 19th centuries when all former holders of the rank were deceased). The rank of field marshal is the highest ranking military officer in the British and certain other armies, and of the second-highest rank in the French army.