It seems like one of the few recurrent images of soldiers wearing glasses. After watching a WWII documentary the other night I noticed a couple of photos of Japanese soldiers wearing glasses and began to wonder why you don't see as many images of other contmeporary soldiers wearing glasses (in fact the only other similar image that comes to mind is American soldiers in the Vietnam War wearing thick framed glasses).
It's a caricature of Hideki Tojo, Japan's Prime Minister for the majority of the war.