The commander of Fort Ruckus in Alabama has ordered that all military personnel who are not vaccinated wear face masks while on base.
Major General David J. Francis, who has commanded the base since 2019, updated the rules on Tuesday.
Alabama is seeing a rise in COVID cases, and has the lowest vaccination rate in the country, jointly with Mississippi.
Only 33 per cent of the state's population fully vaccinated, according to John Hopkins University, and Alabama's positivity rate has increased to 4.8 per cent - its highest point since mid-May.
On Tuesday, Francis ordered that all 'unmasked, fully vaccinated servicemembers must be prepared to show proof of vaccination (CDC vaccination card or other medical documentation).'
Major General David J. Francis, the commander of Fort Rucker in Alabama, on Tuesday announced that all service members should expect to be asked to prove they were vaccinated against COVID-19, unless they were wearing a face mask
Fort Rucker in Alabama is home to around 20,000 members of the military, their family, and civilian staff
The base is home to 5,009 military members; 10,104 civilians; and 5,097 military family members.
Civilian employees cannot be asked about whether they have been vaccinated 'unless the supervisor has a reasonable basis to believe, based on reliable evidence, that the unmasked employee is not fully vaccinated.'
The guidance states: 'Any supervisor who suspects an unmasked civilian employee of not being fully vaccinated should first talk with their legal advisor and thoroughly document the basis for his/her belief before taking any action.'
Military personnel who are not vaccinated are banned from all bars, night clubs, dance clubs, spas, massage parlors, and tattoo parlors.
They must also quarantine for seven days if they travel more than 250 days from the base.
