What is the NATO code of FitzRoy James Henry Somerset's rank?
FitzRoy Somerset, 1st Baron Raglan: Field Marshal FitzRoy James Henry Somerset, 1st Baron Raglan, {'1': ", '2': ", '3': ", '4': "} (30 September 1788 – 28 June 1855), known before 1852 as Lord FitzRoy Somerset, was a British Army officer. Field marshal (United Kingdom):  A five-star rank with NATO code OF-10, it 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).
OF-10