Creating an ISO file from a bootable USB stick

Is it possible to create an ISO file from a bootable USB stick? (On FreeBSD, of course)

I Googled the title of the thread and that took me to


where it says

How to convert bootable USB into an ISO file​


where it tells me
Converting an ISO into a bootable USB or DVD is fairly easy.
.... not exactly what I wanted to know.....

I guess I need to use sysutils/mkisofs, which has been updated in almost 20 years.
 
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