So... I decided to transfer some IRA funds from Vanguard to a PenFed 5yr CD. Following the PenFed instructions online...
...I printed out and completed three copies of the IRA Transfer Authorization form, asking that $X amount be transferred from my Vanguard Money Market IRA account to an IRA CD at PenFed.
I was surprised this morning when I saw that Vanguard had transferred the funds to PenFed - twice. It seems PenFed thought the three copies (specified in their instructions) were three separate requests for transfer, and submitted all three to Vanguard. Vanguard only honored two of the requests because there were insufficient funds in my Money Market account to cover the third request. Sheesh...
Lesson learned: When all else fails, sometimes following instructions doesn't improve your chances of success.