Coronavirus clue? Most cases aboard U.S. aircraft carrier are symptom-free
This figure does not surprise me.  It is in line with Iceland finding that 50% of people they tested were asymptomatic.However as https://www.propublica.org/article/what-we-need-to-understan... notes, in other samples about 75% of people who were asymptomatic at the time of the test went on to develop symptoms.  So the fact that these sailors are currently asymptomatic does not mean that they will remain so.See https://www.cebm.net/covid-19/covid-19-what-proportion-are-a... for more on how different data points are all over the place.