Employer (a defense contractor) wants me to sign form I've never heard of during offboarding
So, I put in my 2 weeks on Friday. They fast-forwarded the end date to be that day because I was going to do remote and they wouldn't go for that. Fine. At 4:30. I went into the office (with HR and CEO) to offboard and they had a bunch of papers for me to sign. One of them was called "Sensitive Compartmented Information Nondisclosure Agreement". I had already signed an NDA previously, so I was (and still am) confused as to why I should sign this thing. I wasn't informed of having to sign this document.
Anyway, I was told by them that I had to sign and they got aggressive when I asked questions. They also told me that not signing would be criminal. It felt off so I did not sign. Can anyone, particularly those who work(ed) in defense shed light on this? Thanks!
Edit: I should have mentioned that I have a top secret clearance and worked with classified information.