The incidents are unrelated and under investigation, service officials said.
A search for carcinogens at Vandenberg Space Force Base, California, found low levels of contamination at two sites.
The Department of Veterans Affairs is considering offering easier access to disability benefits to airmen in the nuclear missile community.
An Air Force analysis of 2.2 million airmen's medical records revealed 198 cancer cases among missileers and 5,063 cases across the wider service.
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