Department of Defense Activity Address Code

The Department of Defense Activity Address Code (DoDAAC) is a six position code that uniquely identifies a Department of Defense unit, activity, or organization that has the authority to requisition, contract for, receive, have custody of, issue, or ship DoD assets, or fund/pay bills for materials and/or services. The first positions of the code designate the particular Service/Agency element of ownership.

Source: Wikipedia — Department of Defense Activity Address Code (CC BY-SA 4.0)