Have a Windows Server 2012 R2 machine that runs the Server Core (no-GUI) installation of the operating system? Maybe that server has a volume that is protected with BitLocker Drive Encryption? If so, how would you unlock the encryption so you can access the data on that volume without using a graphical user interface?
With PowerShell of course, specifically the Unlock-BitLocker PowerShell cmdlet:
Unlock-BitLocker -MountPoint 'D:' -Password (Read-Host 'Enter Password' -AsSecureString)