I believe that the VVA is a group of phoney 'Vietnam Vets' that are actually anti-war activists..
I don't have time to Google it right now but I think it was the same as the VV for Peace that Kerry was involved with.
I think that was the VFW that developed as an influence from the Vietnam Veterans against the War.
Although, I don't know the origin of the VVA, so maybe it does have a similar history.