When I called, the rep said it was in response to incomplete DFAS info. It's well past the normal 3 year statute of limitations. Anybody else dealt with this?

I thought you had to keep records for 7 years.

When did you file? Your 3 year clock starts at the later of the due date or actual file date. If 2010 was a CZTE year for you, you could easily still be within that window.

I've had the IRS query me about CZTE in the past. Each time it was only to confirm the effective dates. No idea what they want with you, of course, but it's not necessarily anything to sweat about....

I used a little more Google-fu and figured out I got a CP04.

I filed prior to tax day in '11. Maybe they're asking for employment tax info.

Not that unusual...I've had to do it twice over the last 10 years or so.