An executive order by President Trump states that it permits Pentagon to bring 1000,000 military reservists to assist in coronavirus response.
According to the White House press briefing made on 30 March 2020, the President and the health officials mentioned that the COVID-19 fatality predictions would be in hundreds of thousands in the weeks to follow.
Therefore, it can be inferred that bringing military veterans back to duty for the coronavirus response was, at least in part, due to the fatality predictions.
The COVID-19 pandemic has given rise to a lot of potentially dangerous misinformation. For reliable advice on COVID-19 including symptoms, prevention and available treatment, please refer to the World Health Organisation or your national healthcare authority.