Does this calling require sustainment?

I have reviewed the chart of callings over and over looking for an answer and cannot find it. Is YW assistant camp director a calling or an assignment? What other callings fall under this, if the calling is a custom one, does it get sustained? Thanks in advance.

Based on the first sentences in Handbook 2 sections 19.3 and 19.4, I've always assumed that if a position isn't explicitly listed as on assignment in the Chart of Callings then it should be sustained and set apart.

In every ward I've been in an assistant camp director has been sustained and set apart.