How times have changed - 
1921 - and again in 1926 when things went to getting out of hand again. https://www.uspis.gov/history-spotlight-2023/send-in-the-marines “You must, when on guard duty, keep your weapons in hand and, if attacked, shoot and shoot to kill. There is no compromise in this battle with bandits. If two Marines guarding a mail car, for example, are suddenly covered by a robber, neither must hold up his hands, but both must begin shooting at once. One may be killed, but the other will get the robbers and save the mail. When our Marine Corps men go as guards over the mail, that mail must be delivered, or there must be a dead Marine at the post of duty.“ - Secretary of the Navy Edwin Denby, November 1921
Article from September of 1926 