A senior U.S. Army flight surgeon who warned that pilots could die in mid-air from COVID-19 vaccine side effects testified Tuesday at a roundtable hosted by Sen. Ron Johnson on Capitol Hill. Testifying under the Military Whistleblower Protection Act, Lt. Col. Theresa Long told the Wisconsin Republican at the event that she had grounded vaccinated pilots to monitor symptoms of myocarditis — including chronic fatigue — that could cause them to die of heart failure in mid-air.