If for some reason we do not get volunteers then we have to assign it mandatory to whomever has been the longest since they worked volunteered for a holiday.
(In case more than one person wants to work the day, we also give it to the person who has been the longest since working a holiday.)
...
New Year's Eve (volunteered):
1st Shift Mark (v) and Alex (regular shift)
2nd Lori
3rd Collin
Winter Recess:
26th - 1st shift Mark (volunteered)
2nd Shift Casey (volunteered)
3rd Shift Collin (regular shift)
...