I wish this was appended when I studied Marathon and Carthage. Badger, I actually had a class in gov’t service taught from Sun Tzu. We focused on his use of spies.
Many have seen the chevrons on our battle tanks in past Middle East wars. The chevron is from the greek letter Lambda used by the Spartans to represent their city/state Lakedaemonia and/or King Leonidas. It was the only such symbol they allowed. That chevron from one of the first groups of citizen soldiers echoes today.