"The challenges inherent to the cyber domain are considerable," the Navy secretary wrote, "but failing to mitigate cyber risks is not an option."
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
Rules regarding how much money colleges could get from federal sources had been under scrutiny for years.
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