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.
An Army reservist who shot and killed 18 people in Maine last year had significant evidence of traumatic brain injuries.
Robert Card's mass shooting was the deadliest in Maine history.
The hospital where the Marines were sent had been planning a mass-casualty response training for the day of the real-life emergency.
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