Tain't Marine One just as it isn't Air Force One, as others have said, the call sign(s) is/are reserved for the 'sitting' President. Don't know what is used in their place but if it is used as M-1 or AF-1, then it is one more devaluation attached to this President.
Just thought to ask, is Obama taking TOTUS with him? They have had such an intimate relationship over these past 8 years.
I hope they take Barky’s mother-in-law too. It would be sad for the Trumps to have to put her out with the trash.