I found the website of this interesting group a few months ago whilst doing some personal research. I'm not sure if I've mentioned it here before or not.

Granaderos de Galvez

Mission
The mission of the organization is to inform the public about Spain’s substantial
although generally little known contributions to the success of the
American Revolution.

Activities
Our members include professional and amateur historians and educators who
perform individual research, write articles, or deliver speeches at public or private
events. We also participate in civic or patriotic ceremonies and parades. In most
activities, we wear Spanish colonial uniforms and carry the Betsy Ross colonial
American flag and the Burgundian Spanish colonial flag to symbolize the
collaborative efforts of Generals George Washington and Bernardo de Gálvez
during the American Revolutionary war.

Membership
Membership is open to anyone who is interested in helping carry out the mission
of the organization. It is not based on genealogical criteria.