Living overseas, moving back to states for Army job, T3 investigation question

I am a natural born citizen of the United States, both parents natural born, I grew up overseas(Close ally) when my parents moved for work while I was at a very young age. I have been living overseas for 99% of my life, I spent just less than a year back in the U.S. when I was a teenager about 10 or 11 years ago.

I am in the process of moving back to join the Army and I am just wondering how much of a problem its going to be passing a T3 secret investigation now that the Army requires everyone to get secret minimum?

My worry is not being able to get 3 suitable U.S non family references I can write down on the SF86, and I was door knocked by police for political internet posts by police(not US) although it was informal, there is no record of it, and I was never charged, detained, cited, fingerprinted etc, was just a quick chat and that was that.

Bit of a unique one here I know, appreciate any help. Thanks.

My understanding on the SF86, I haven’t read the police section in a while but from what I remember they only care about documented cases involving police/courts, like charges filed, citations, court records(Basically anything thats been documented) etc. If I have none of that, and it was just a short chat with overseas police, do I even need to mention it on the SF86?