The caption for the emblem image said "The Department of the U.S. Army emblem, occasionally thought to be the 303rd's Unit Insignia" even though the emblem was definitely NOT the emblem of the Department of the U.S. Army.  Here the phrase "that is" must be implied between "emblem" and "occasionally," and the way to do that is with a space rather than a comma.  I lack the patience to see whether other misleading commas have been introduced into the article.