What are the source(s) of the “muddy bootprints” home invader threat analogy used in the context of UFOs/UAP?

This analogy has been used by Lue Elizondo. Does anyone have the full quote, or a source (or sources), or both?

I also recall the home invader analogy being used in the context of UAP by someone else.

I think by one of Gary Voorhis, or Sean Cahill, or maybe someone else involved in the NIMITZ incident. I don’t recall where I saw that, and wasn’t able to find it by searching. Anyone know of anyone other than Lue using it in the context of UAP?