The first Rambo wasn't even called "Rambo". It was "First Blood(as in "who draws it")". "Rambo 2" was called "Rambo: First Blood Part 2" so technically, by saying you "didn't even know there was a Rambo 2", it demonstrates that you did know there was a "Rambo 2", because "Rambo 1" was referred to as "Rambo 1" only after "Rambo 2" was released and the term "Rambo movies" adopted by the masses of undying Sylvester Stalone fans(his mom).
"Technically".
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Wouldn't the nomenclature be Rambo II: First Blood Part III? "