You would think the lessons of Vietnam in the past with a determined dispersed enemy fighting on home turf and willing to take enormous losses would be instructive. Or we could look at Ukraine fighting Russia to a standstill with 2000 dollar drones and the help of US defensive missiles, an Army fighting an existential fight. We lack any diplomatic experts engaged in Iran, like Mattis said: ‘without diplomats you’ll need to make a lot more bullets.’