They don't. They do have a role in "Terminal Security".
"Terminal Security" is not "Port Security" and "Port Security" monitors "Terminal Security".
I'm a bit confused... trying to wrap my brain around a terminal being part of a port, but terminal security not being part of port security. What am I missing here? Why would the terminal operator be listed under "Who secures the ports" in the list in post 6 if they are not part of port security?