I had a lot of fun translating this. I had no previous knowledge what the symbols meant but noticed the word Discipline almost immediately. It helps greatly to know the language or words that symbols translate into. From top (12 o'clock) in a clock-wise fashion the symbols translate as such:
1. D I S C I P L I N E = Discipline 2. H O S P I T A L I T Y = Hospitality 3. I N D V S T R I O V S N E S S = Industriousness 4. S E L F R E L I A N S E = Self-reliance 5. P E R S E V E R A N S E = Perseverance 6. C O V R A G E = Courage 7. T R U T = Trust or Truth (seems like a letter was omitted) 8. H O N O R = Honor 9. F I D E L I T Y = Fidelity
Also, this is stunning work, a well crafted shield!
I was also gonna ask why it was called Mjölnir if it's a shield, but I then realized that an emblem (or whatever) of Mjölnir is actually ON the shield. It's just the mythological one, not the Marvel one