Rollinson vowed to seek resources for the Office of Chief Counsel to litigate cases of high earning tax cheats.
The agency's executive director was found to have used her position to get one of her partners promoted.
More than 430 senior military officials had their promotions and confirmations delayed last year due to Capitol Hill political fight.
A Pentagon watchdog found "severe and systemic" problems with the unit’s internal controls on medication, among other issues.
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