Looks like it could be William Robertson. Did he exist?
Here is one list. Shows William at #40.
https://patriotpost.us/references/75778-clinton-friends-who-knew-too-much
Also, a Jarrett Robertson died in helicopter crash in 1993.
Robertson was a bodyguard.
DEAD BODYGUARDS
Maj. Gen. William Robertson
Deputy Commanding General, V Corps, Europe
SOURCE: http://greater-yellowstone.com/usa/clinton/thedead.htm