This thread is really old, but also the first Google hit for "mil-hdbk-217g", so I figured I'd close out the thread.
I emailed commandstandards at navy.mil, per FedBizOps regarding the update.
They confirmed to me today that the project was discontinued, and that there is no MIL-HDBK-217G.
Thank you all for the lead on tracking it down. I'm trying to develop my company's electronics quality policy, and was hoping to read it as a reference.