Testing equipment.
They probably don’t use it as much since he just stays in most of the time, and you can’t let something like that just sit around unused.
Usually it would be for the new guy(s), but it could also be a warm up for night children flights.
Familiarization flights for a new pilot on the Presidential detail? They wouldn't let him fly the prez for his first landing and take off at the White House.
They are called touch-and-go
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