This should be an easy question to answer. How many military personnel contracted covid-19?
(April 15)
The Defense Department’s total overall COVID-19 cases hit 5,088 on Wednesday, continuing an upward trend of hundreds of cases as day a Pentagon leadership continues to try to stem the spread of coronavirus in the force. More than 300 troops, civilians, dependents and contractors were diagnosed between Tuesday and Wednesday.
Snapshot: DOD and COVID-19
May 13, 2020 | By Jennifer-Leigh Oprihory
Number of COVID-19 cases in DOD, as of May 13:
8,210 cases, 272 hospitalized, 3,682 recovered, 27 deaths
https://www.airforcemag.com/snapshot-dod-and-covid-19/
From unclassified military news reports, "a lot". The military is quite concerned about it and is taking a lot of preventative steps.