The U.S. already possesses a powerful nuclear arsenal. So why expand it if the goal is purely deterrence? Is the Pentagon exaggerating the threats to secure more funding? It's hard to imagine any bomber making it to a nuclear-armed adversary and successfully dropping a bomb, especially with today’s advanced missile defense systems — let alone making it back. How will modernization shift the balance of power? Will it make the world safer, or could it lead to greater instability? What do you think?