It is hard to imagine a world where the (US) military did not make plans for a pandemic like the coronavirus (COVID-19). Each and every military must have a plan for weaponized bio-warfare. In fact, every military will have their own plans for ways they can weaponize biowarfare. Think about the types of bioweapons the terrorist groups might want to employ?
The military has been planning for the big issues of global warming and has been shouting out that climate change is one of the biggest risks to the world in the future. Droughts and rising sea levels will produce mass instability in regions, much along the line of the human tragedies in Chad, Sudan, Syria, etc. For decades now, the military has warned of the risks of climate change on US national security. Pentagon, for example, here.
With the pandemics that have passed through (Ebola, SARS, mosquito-borne) over the last 10-20 years, this too is a national security threat.
In the spirit of Scenario planning, setting up sign-posts and early warning signs, you have to wonder when the military started to escalate the coronavirus outbreak in China to the highest risk levels of world, and therefore US pandemic. November? December? The military would already have contingency plans to help other countries. By early December 2019, the signposts were visible for a spread from China to the rest of the world. By mid December, the US mainland would have been clearly at risk.
The power of having scenario plans, early warning signs, and contingency plans, can break down anywhere along the line. All of the planning in the world is useless, if you don’t react and implement.