Systems and Analyses Center
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The Institute for Defense Analyses' Headquarters facilities and its Systems and Analyses Center FFRDC are located at 4850 Mark Center Drive in Alexandria, Virginia.
Visit letters passing clearance information should be faxed to 703-845-2588 (nonsecure fax).
If you are sending a visit letter electronically, the IDA SMO Code is 7A2934. To verify receipt of a visit letter, call 703-845-2000 or 703-845-6900.