Get the Employment Category List. 

This is a listing of all of the public domain Employment Category items. These are referred to as Labour Force Status in VETtrak. 

Each Employment Category item is represented by a TEmca. The collection of Employment Category items is represented by a List of TEmca. 

Since this data is public, no authentication is required. The returned Auth is used only for status and messages.

[WebMethod(Description = "Gets a list of all employment categories")]
public TAuthEmcaList GetEmploymentCategoryList();