Rare visitors to Schiphol Airport today were a duo of US Army Mississippi ArNG Sherpas. This one was delivered in Sep 1990 as a C-23B (ex G-BSJJ), then converted to C-23C (upgraded avionics) in 2003. It became N423NA with the NASA (Goddard Space Flight Center) in Sep 2011, but that reg was cancelled in Oct 2014 and it may never have actually been operated by them. It was offered for sale in 2015, fate unknown.
This photo was added on 8 March 2018, and has since been viewed 59 times.