<https://www.usmilitariaforum.com/forums/index.php?/topic/341915-v-serif-vs-non-serif/#comment-2755043>
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"I feel embarrassed in that I think I knew the date at one time but I can't remember off the top of my head.\n \n\n\n\t \n \n\n\n\tI did look back at my photos and I have posthumous Army BSM groups from 1951 that have the serif-model \"V\". \n \n\n\n\t \n \n\n\n\tMy assumption is that the Marines and Navy probably switched about the same time as the Army, so sometime prior to 1951. \n \n\n\n\t \n \n\n\n\tMy gut seems to tell me that it was 1948 that they switched from non-serif to serif, but I have been able to find no hard data to back that up. \n "
<https://www.usmilitariaforum.com/forums/index.php?/topic/341915-v-serif-vs-non-serif/>