“Sure I wave the American flag. Do you know a better flag to wave? Sure I love my country with all her faults. I’m not ashamed of that, never have been, never will be.”
– John Wayne
According to Wikipedia, William Henry Johnson
was a United States Army soldier who performed heroically in the first African American unit of the U.S. Army to engage in combat in World War I. On watch in the Argonne Forest on May 14, 1918, he fought off a German raid in hand-to-hand combat, killing multiple German soldiers and rescuing a fellow soldier while experiencing 21 wounds, in an action that was brought to the nation’s attention by coverage in the New York World and The Saturday Evening Post later that year. On June 2, 2015 he was awarded the Medal of Honor by President Barack Obama in a posthumous ceremony at the White House.
However, Wikipedia also seems to say that Henry Johnson fought off the Germans with the help of Needham Roberts, who also was severely wounded and also received the Purple Heart and the Croix de Guerre.
According to the Library of Congress President Woodrow Wilson proclaimed a national Flag Day in 1916 to commemorate the 1777 adoption of the Stars and Stripes. You can read more about the history of Flag Day at USFlag.org