Welcome to the forum!
It really depends on the mood you want the picture to say. Id suggest George Orwell's "We sleep safely in our beds because rough men stand ready in the night to visit violence on those who would do us harm." if youd be willing to go that far.
Here are some other good ones by Patton...
Quote:
Wars may be fought with weapons, but they are won by men.
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Quote:
I am a soldier, I fight where I am told, and I win where I fight.
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Perhaps if you can provide some more information I could find a better fitting quote.