CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS
Published on March 29, 2002
EXHIBIT 23.1
CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS
As independent public accountants, we hereby consent to the incorporation by
reference of our report included in this Form 11-K, into the Company's
previously filed Registration Statement on Form S-8 (File No. 333-16837).
/s/ ARTHUR ANDERSEN LLP
Vienna, Virginia
March 25, 2002