Captain General of the Air Force (Spanish: Capitán General del Aire or Capitán General del Ejército del Aire) is a five-starair force officer rank and the highest rank of the SpanishAir Force. The five-star NATO rank code is OF-10. The honorary appointments formally ceased in 1999. The rank of Air captain general is equivalent to a Marshal of the Air Force in many nations such as the United Kingdom, a general of the Air Force of the United States, a capitain general of the Spanish Army or the Navy. This rank is reserved to the monarch as Commander-in-chief. An Air captain general's insignia consists of two command sticks under five four-pointed stars below the Royal Crown and a golden string.