I don't like guns, but if you have to go hunting you should at least know how to shoot straight.
Also note: the list of the war dead from recent World War I actions on the same page as the comic. The US had entered in April 1917. By September 1918, Germany's last great offensive had failed and the Allied Hundred Days Offensive was in progress; this would lead to the Armistice of 11 November 1918, and the Treaty of Versailles the following year. By that point over 20 million people will have died and about the same number wounded.