https://en.m.wikipedia.org/wiki/Charles_D._W._CanhamGave the 8th Infantry Division their motto, “These Are My Credentials”.
"It was in his capacity of Assistant Division Commander during the surrender of the German garrison at the Port of Brest (see Battle for Brest) that Canham unknowingly gave the 8th Infantry Division its motto. Upon entering the headquarters of Generalleutnant (Lieutenant General) Hermann-Bernhard Ramcke, a leader of German paratroops, Ramcke demanded to know the lower ranking Canham's credentials as a condition of surrender. Unruffled, Canham pointed to the dirty and tired American soldiers he had brought with him to witness the surrender and said, 'These are my credentials.' The account of this event, which was reported in The New York Times, saw in this spontaneous statement of a combat leader the greatest tribute ever paid to the real power of the American Army, the individual soldier."