I had those exact wasps working security for me a few years ago... (Nest right next to door).
Was very disappointed when they failed to return.
seems like they were through by August.
Re: aggression...
at my house... they are a great benefit in the garden... I've even worked right next to nests and never noticed till later...
But...(last summer), I did have a nest on a bush next to the house that I forgot about one day as I was pulling blackberry briars... a wasp reminded me...
When stung... I find that a clove of elephant garlic sliced in half and salted... placed on the sting works pretty well.
