Yes, true, but before JFK's death, there was no official protocol in how to deal with a current or former President's funeral.
The Reagan family is following the protocol set after JFK's death.
And to add, it will be laughable and sad, IMO, to watch a Military Honor Guard bringing in Clinton's casket, for he will be ever known as the President who "loathed the military".
I remember hearing that, if you examine tapes closely, during every administration, that, before the President exits Marine 1, the Marines face toward the White House until the President gets to the steps leading down out of the chopper, then they turn in and face toward the steps. Not so during the Clinton administration aberration, I've heard but never confirmed.