My brother-in-law wore a “four service medal” in Korea when the DMZ was still “hot” (circa, 1969). It had each service represented and St. Michael in the middle. It is still available from Aquinas and More and a lot of other Catholic outlets.
When I watch “The Untouchables,” the medal that Sean Connery has is “Saint Jude.” No offense to St. Jude but the St. Michael medal is actually in the shape of a “police badge” and my whole family wore it. We had them blessed in fives and tens. My mom would have killed my dad if he left home without it (he kept it on his key-ring with his “call box key”).
That is “old style Catholicism, Mother.” The patron against the forces of hell was always Holy Michael Archangel.
If your son is joining the Marines, see if you can get him an Archbishop Fulton Sheen WW-II prayer book. They were available for $5.00 from somewhere and I sent a bunch to Iraq. Still have one in my living room... It has everything under the sun in it.
I've seen the "four service medal" somewhere. Also the St. Michael in the shape of a badge.
Isn't it St. Florian for the firemen?
I have a keychain with a medallion that has Pope Benedict on one side and Pope John Paul on the other.