I had posted a query about the VCA to the list some time ago and have just found a more amplified explanation on the New York History Blog/New York City's Evacuation Day Planned (http://newyorkhistoryblog.org). *"In the years immediately following 1783 there were apparently spontaneous demonstrations and parades around Bowling Green on Evacuation Day, which were largely led initially by Revolutionary War veterans. It was on Evacuation Day in 1790 that the New York Veteran Corps of Artillery (“VCA”) was formed as a company of soldiers designed to defend the City."*