I would argue that the last battle was what the US saw occur in China and Italy. We knew the virus would reach us within weeks of those countries being hit, knew the risk potential of it, but did little to adequately prepare.
How would temperature and subjective screening prevent these asymptomatic patients from infecting many others?
Doing widespread spot testing across the country would've identified the communities where the virus was extant. From there we would've known where to focus the brunt of universal testing, tracking and quarantining.
Just the fact that we are still fiddling with estimates of what percentage of CV infected people are asymptomatic is a travesty. We should have long ago conducted enough statistical sampling to have a very clear picture what was happening in our communities.