Encrypting a File System: No pass w/usb key

I just got done reading an article about encrypting a filesystem on Linux and using a USB drive to hold the key file in place of entering a password at boot time. I searched around a bit and haven't found anything of the same for FreeBSD and would much rather use FreeBSD for the implementation I have in mind. Any kind of direction on this would be greatly appreciated.

Thanks in advance!
 
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