It's a display of power. We've been stuck in a certain mindset from the Cold War and habits are hard to break. Over time we've dialed back on the heat (we don't

It's a display of power. We've been stuck in a certain mindset from the Cold War and habits are hard to break. Over time we've dialed back on the heat (we don't do live tests anymore for instance and we are not actively developing new warheads). But there's still a whole military industrial complex that is not going to go away anytime soon. So you do this new missile. It keeps people employed, it shallowly reminds other powers that we're still doing perfunctory defense stuff.