Swain's Island, American Samoa

I just came across a mention of a flag for Swains Island at the Department of Interior website:

Mr. and Mrs. Stevenson also saw on Swains Island a remarkable variant of the United States flag. Old Glory flew on the flag pole, but superimposed on the blue canton was a white dove. They learned that at one time a bird had come and cried over the community at night, foreboding pestilence, and the dove had been added to the flag to propitiate this omen of evil.

Mikael Parkvall, 8 April 2007