I've been calling him a checkerwing dragonfly but I'd like to know his real name. This is the first good picture I've gotten. You have to look for him against the chain link fence, but once you spot him, it's a pretty clear image.
I notice from the Wiki that this is an immature male; I've never seen a mature female with the actual white tale. But those wings are gorgeous! I've tried to photograph one of these for a long time and this was the first one that held still long enough.