Don Barclay (December 26, 1892 – October 16, 1975), seated on the right in the image above, was a Hollywood actor, voice actor, and artist who persevered to tour a number of regions during WWII providing USO shows and other entertainment to US servicemen. He was greatly appreciated by the GIs for not dropping out, for example, feigning illness or finding other excuses for stopping his entertainment tours (unlike a number of other famous people who are remembered as having abandoned entertainment tours once they discovered the poor conditions they would perform in, or live in). He toured a large number of bases in North Africa, Arabia, India and China, in 1943, often as a one-person act. He drew caricatures of service people as he traveled, and left those signed sketches with the people he drew (see an extremely rare sample here). By the time Barclay returned to China in 1945, he estimated he had drawn and given away over 10,000 caricatures.
Official caption for image above: "Don Barclay, Famous Artist And Caricaturist, Informally Sketches A Group Of Hospitalized Service Men During His Visit To An American Army Hospital In China. 7 April 1945."
(See Wikipedia entry for Don Barclay here.)