[zeestephen]

I assume a USA lieutenant general has always worn three stars?

Just 50 years later, in World War One, John J. Pershing became America’s first six star general - General of the Armies of the United States.

In 1978, George Washington received a posthumous promotion to the same rank.

[Bull Snipe]

Yes, Lieutenant Generals have always worn 3 stars.

[Future Snake Eater]

John J. Pershing became America’s first six star general

Five star general.