Followed steps from this blog to get the job done. Also learned you *can* save the BitLocker startup keys for multiple computers on one USB drive (per the Microsoft BitLocker FAQ).
1. Run the Powershell command Install-WindowsFeature bitlocker
2. My server core was joined to a no-longer-existent domain, and the sconfig.cmd utility wouldn't let me dis-join it! So, I ran netdom remove /d:domain hostname /force
3.Edited the registry to allow BitLocker to work w/out a TPM.
4. Ran through the following three commands