Call it what you want, but your company's creation and overall existence is to create and improve tools of war for profit. I'm glad your particular project is "for good" but don't lie to yourself/us about the bigger picture.
lockheed does a crap ton more than just war products, but you'll never hear of it because you don't come close to having the clearance. Actually, most private contracting companies do. So don't preach about the big picture when you can't even see the full picture.
Only a small fraction of medical companies are changing the world by making people live longer. Rest everyone is trying to change by making people rich. Be it Hyperloop, SpaceX, Alphabet,Amazon, Facebook, the path to change is to break new frontiers so that more people are engaged in economic activity.
So no harm in chasing money. You will make a change by doing this.