You're right about not needing title/diploma to learn medicine. I was the OPS boss onboard the USCGC DRUMMOND, until they gave me the additional duties of "Medical Officer". My specialty was: OB-GYN! Uncle Sam assures us all that our military men & women get the finest medical care in the world,,, yea, RIGHT
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QMC, USCG (Ret)
The best luck is what you make yourself!