Nine Schriever personnel got sick after a potentially hazardous material incident at about 10 a.m. Wednesday.
The patients complained of throat irritation. They were evaluated at Schriever before being taken to Memorial for further observation. They were later released.
After a search by first responders on Schriever, Building 300 on the Air Force base was cleared of any potentially hazardous materials around 4:30 p.m.
The building is back to normal operations now. The cause of the incident is under investigation.
"People are our most valuable resource and we appreciate everyone's patience as we worked to ensure their safety," said Col. Wayne Monteith, 50th Space Wing commander.