It is a little hard to read but It always amused me to look at my dogtag. My middle Initial is an "S." My blood type is an "A." My religion is Protestant and is marked by a "P." Lined up it reads "SAP". This always gave me a chuckle. My friend Harry Shively told me the T50 means that I had a Tetanus shot in 1950. I never knew what it was until now.