Oh yeah, i've seen plenty of those. And they are nasty bugs! However, I once watched one swoop down and grab a fly. He then chomped the fly until it was a little round pellet, presumably about big enough to stuff in a cell of his/her nest. But, they're nasty tempered bugs.Found it . THis bugger is a hornet. Talked with DS so about it today. ANd my DS said it was vicious and attacked. BUT ate lots of bugs. Not a bee, and not a true wasp.
http://www.insectidentification.org/insect-description.asp?identification=Bald-Faced-Hornet
LOts of these around this year.