What would FAA controllers be referring to when mentioning "code 0027?" In the second video on "You Need To Hear These FAA Tapes From That Oregon UFO Incident That Sent F-15s Scrambling," you hear controllers mention a code 0027. If the target in question had a transponder, the content of the article is misleading. Does anyone know if code 0027 refers to something specific in ATC terms, or are they just referring to a transponder code?

Here's the full link to the article. http://www.thedrive.com/the-war-zone/18473/faa-recordings-deepen-mystery-surrounding-ufo-over-oregon-that-sent-f-15s-scrambling
In the video the controller states that the target was a "code" 0027, which would indicate a transponder code.  Using ATC radar (in this case ARTCC) the controller can see what a secondary radar return (transponder) is squawking.  In this case apparently it's "0027" and displaying an altitude of 37,000 ft.

According to FAA Order 7110.66E entitled "National Beacon Code Allocation Plan (NBCAP)" code 0027 is assigned to ZAU (Chicago ARTCC) and is listed as IS-3 (code category) IS= Internal Departures - Special Use.

Here is the link 7110.66e

I have no clue as to why that transponder code is attached to that target in Oakland Center's airspace.