Leave it to my wonderful husband to find an example of OPSEC in the Bible. I don't have time to share all of the notes from his lesson, but it is a Bible topic fitting for teens, young adults, and those in or interested in the military.
“If you don’t tell what we are doing, we will treat you kindly and faithfully when the Lord gives us the land.” Read more in Joshua 2
"Operations Security (OPSEC) is the process by which we protect critical information whether it is classified or unclassified that can be used against us. ... OPSEC challenges us to look at ourselves through the eyes of an adversary and deny the adversary the ability to act." source
