Over the next couple days, White House staffers will go through the time-consuming process of turning in their passes, coded lapel pins, BlackBerries, cell phones and security clearances. At 9 p.m. Friday, the highest level staffers will turn in their gear and the West Wing will become something of a ghost town.
Chief of Staff Josh Bolten, Gillespie and Perino will remain on standby.
On Tuesday, Special Agent Donald White will shadow Bush, sit in the customary front shotgun seat of the limousine, and guard the president until noon.
Then, White will step over to position behind Obama.
ABC News' Ann Compton contributed to this report.