Here's why:
* Modern Armies are Mechanized: Most modern armies rely heavily on mechanized vehicles and technology, making cavalry units with horses largely obsolete.
* Historical Cavalry Units: Historically, armies did have cavalry units (sometimes called "horsemen" or "mounted troops"). However, they had various names depending on the specific army and era, like "Light Horse," "Dragoons," or "Lancers."
* Possible Misinterpretation: It's possible that you're thinking of a specific historical unit, a fictional unit, or a colloquial term used within a particular region or context.
To get a more accurate answer, could you provide more context or information about what you're referring to?