CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS


     As independent public accountants, we hereby  consent to the  incorporation
of  our  report dated March  7,  2001, included  in  this  Form 10-K,  into  the
Company's previously filed Amendment No. 1 to  Form S-4  Registration  Statement
No. 333-25355 and post-effective Amendment Nos. 2 through 5 on Form S-2 to  Form
S-1 Registration Statement No. 33-59279 and Form S-8 Registration Statement  No.
333-38034.








Vienna, Virginia
March 27, 2001