Secretary of the Army John McHugh administered the oath of office to Civilian Aide to the Secretary of the Army William F. Murdy in the Pentagon in Arlington, Va., March 31, 2014. Civilian Aides to the Secretary of the Army (CASA) provide a vital link between the Army and the communities for which they serve. CASAs are usually business or civic leaders who possess a keen interest in the welfare of the Army and their communities.