It’s like the “get out of military service” stories. Some involved chocolate (I’ll stop there), others declaring your love for communism (I.e. the Soviets), and all sorts of stuff. Pretty sure it was mostly tales :)
That said one of my favorite punk bands disbanded because the bassist refused military service and got jail time. Worked out ok because they reformed into another band without him, and I honestly think he was just waaaaay too left for it to be a good thing.