Which Cabinet department has been most frequently led by military personnel?

Question

Quizplus · Accepted Answer

The Department of Veterans' Affairs has fittingly been led by a member of the armed forces more frequently than any other Cabinet department, though prior service in the military is not a requirement for the position. Active duty members of the military do not serve in the Cabinet since they would be unable to fulfill both roles simultaneously. Therefore, any military personnel who are to receive an appointment to a Cabinet position must retire or have recently retired from active duty on their own.

Which Cabinet Department Has Been Most Frequently Led by Military