Three U.S troops were killed and at least another 40 were wounded in Sunday's attack on the Tower 22 base.
A Pentagon watchdog found "severe and systemic" problems with the unit’s internal controls on medication, among other issues.
Federal prosecutors had appealed the previous three sentences imposed by another judge, arguing they were too lenient.
Kimberly Jackson had been serving as Deputy Assistant Secretary of Defense for Force Readiness.
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