So here is what I can tell you, there was a case, of a rape, in a town and a enlisted person was a POI. His DNA was in the database for the military. The person who was investigating the case, and had DNA from the victim, contacted the service branch and he was ruled out due to his DNA. I can't tell you more than that. I can say that someone ran the sample and looked at the comparison and it was not a match. As far as CODIS goes, I am not familiar with the military code for that. So thank you for sharing that. It is good to know.
As I stated in my post, if a POI is currently in the military and their name/identity is known to investigators (as in your example), a civilian investigation can likely get information with a probable cause warrant. But that's not anything close to what is going on in the Delphi case.
Here we have a subject whose identity is unknown, but who many people speculate may be current or ex-military because of his demeanor, or what have you.
It is not legally possible that the entities investigating the Delphi case could receive permission to scan the entirety of the US Department of Defense DNA database for military members (which is designed to identify remains of soldiers) to look for possible DNA matches for an unknown subject in a criminal investigation based on a theory that he could be past or present military.
How the military handles CODIS was contained within my original post - if a service member commits one or more offenses of specific magnitude (defined by the Department of Defense), then and only then does their DNA get separately and particularly collected for the purposes of uploading to CODIS for cross-referencing with all other potential crimes.
So when you wrote "he's not in the service or his DNA would be on file," your implication of how LE could access military members' DNA information is not at all accurate.
@Skully and I'd include @JimmyWells in this too, if you are LE or LE-adjacent, that's great. IMO the diversity and varying experiences of the members here add a lot to the threads. Maybe look into getting verified with Websleuths so we can have a measuring stick for your expertise and accuracy of your statements.
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