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UNITED STATES - JULY 21: Sen. Claire McCaskill, D-Mo., questions the witness during the Senate Armed Services Committee hearing on the nomination of Army Gen. Mark Milley to be Army chief of staff on Tuesday, July 21, 2015. (Photo By Bill Clark/CQ Roll Call)

UNITED STATES - JULY 21: Sen. Claire McCaskill, D-Mo., questions the witness during the Senate Armed Services Committee hearing on the nomination of Army Gen. Mark Milley to be Army chief of staff on Tuesday, July 21, 2015. (Photo By Bill Clark/CQ Roll Call)

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