Military.com:
'A U.S. Air Force member jailed since August for publicly calling for President Donald Trump's impeachment is being held in solitary confinement 24 hours a day, according to his attorney.

Watson was arrested July 1 on the steps of the U.S. Capitol, where he demonstrated in uniform with a sign reading "Impeach. Convict. Remove." after speaking at a news conference calling for Trump's removal.'

https://www.military.com/air-force-major-jason-watson-called-trumps-impeachment-solitary-confinement-24-hours-a-day-attorney