The authors wish to
thank all of the simulation professionals with whom they have worked over the
last three decades. This discipline is blessed with a fine group of creative
and productive career scientists. We should also note that much of the work
cited was supported by grants from the Office of Naval Research's STEM Program
(ONR N00014-16-1-2820) and by research assistants supported by the National
Science Foundation Research Experience for Undergraduates program (NSF
1560426). Nevertheless, the positions taken in the paper are the authors’ own
and do not represent in any way the views of the Department of Defense or the
US Government.