A “day” of service. I’m guessing they spent all of 2 minutes at this to get the photos taken, then back in the limo.
Of course...and that was in addition to C-SPAN (immediately after the Flight 93 memorial service in Shanksville) capturing Obama and wife holding hands walking through Arlington National Cemetery in an area where soldiers who fought in Iraq and Afghanistan are buried. They mingled and talked with many of the visitors and posed for pictures.
That's publicity service....