The Navy issued guidance clarifying the so-called "vessel exception" to help commanding officers apply it consistently across the service.
Linnington served in the Army for 35 years before joining the national veterans non-profit.
The Air Force began investigating after an unusual number of troops reported being diagnosed with blood cancer.
By Tara Copp, AP
An ex-Army soldier on military death row for the 2009 shooting at Fort Hood, Texas could face execution after the top military court hears the case.
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