NIST discourages it, but most of the US government still requires it. In fact, I used to have a 60-day password rotation policy with such brilliant requirements as "no more than three characters of one class sequentially."

I soon realised that "ShitFuck!", thus, was a valid password -- and off I went. Meanwhile, a teammate who had previously been a technical writer contracting with the NSA told of the "waterfall method" -- not of software developments, but of passwords. It was common in his world, apparently, and you could always hear he was typing his password by the staccato of QazWsxEdc123, etc.