I'd propose "Category: 2nd Regiment, Worcester County Militia, Massachusetts Militia, American Revolution", but I don't know if that fits with where the project teams are going with regiment categories.
Note that there were other Worcester County militia regiments active in the revolution e.g. Sparhawk's, Doolittle's.
I'm assuming Massachusetts Militia is appropriate, but maybe this regiment was considered one of the "additional" regiments, though I have seen no such evidence.
Please advise. The profile is pretty thoroughly sourced (over-sourced?).