166715 is no longer attached to MCAS Futenma. According to http://www.gonavy.jp/usmcj2011.html, this was a forward deployment of that aircraft.
According to that site:
UC-35D 166715/VMR-1 was temporarily assigned to Futenma at Jan.14 to Mar. 2011
UC-35D 166766/MCAS Miramar was temporarily assigned to Futenma at Mar. to Apr. 2011
So 166715 should be assigned back to VMR-1/2 MAW MCAS Cherry Point, NC.
Larry Van Horn
Brasstown NC