I like where you're going with this, however, the Aorta is one of the most well-protected arteries in the human body. If memory serves, after the aortic arch, where the brachial arteries branch off, it follows the spine down towards the lower extremities, with various arteries breaking off to bring fresh blood to other body parts as needed, before splitting into the iliac arteries. It would be very hard to injure with a gladius. One would need to almost sever the spinal cord to get to it from the dorsal side or carve through all of the internal organs on the ventral side. (Sorry for the rather gruesome image... but you get the point.)
So basically, assuming I understand this correctly, we have a military formation or strategy, a sword, a helm, and something referring to oneself. Could this be more figurative than literal? Is this a message telling us we need to gear up for a war? It almost seems to me like it's telling us to prepare. Think about it. If you're an ancient Greek or Roman soldier what are the things you absolutely need to go to battle? A plan, a weapon, and something to protect your body (helm), and your presence.