Good article, terrible web site.
My only quibble is
Which were the most and least effective of the 10 Indian-fighting cavalry regiments in the West—effectiveness equating to numbers of fights and casualties inflicted?
I feel that is a false dichotomy. The SAC had zero fights and inflicted zero casualties during the Cold War, but was probably the most effective fighting force in the history of mankind. Sometimes, effectiveness means not having to fight.