The eagle which they selected for the Marine emblem is a crested eagle, a type found all over the world. On the other hand, the eagle pictured on the great seal and the currency of the United States is the bald eagle, strictly a North American variety.
Both ghee and clarified butter have the milk proteins casein and whey removed and what remains is butter fat. Casein and whey are proteins in dairy that many people do not tolerate, especially people who cannot tolerate gluten. This is because gluten, whey, and casein have a similar molecular structure.
The tartness of buttermilk is due to acid in the milk. The increased acidity is primarily due to lactic acid produced by lactic acid bacteria while fermenting lactose, the primary sugar in milk.