Washington, D.C. 20549





Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

(Amendment No.     )



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Preliminary Proxy Statement


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Definitive Proxy Statement


Definitive Additional Materials


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Important Notice Regarding the Availability of Proxy Materials for the Stockholder Meeting of


To Be Held On:

June 10, 2019 at 10:00 a.m. Eastern Time

at 1818 Library Street, Suite 500, Reston, Virginia 20190














This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. We encourage you to access and review all of the important information contained in the proxy materials before voting.

If you want to receive a paper or e-mail copy of the proxy materials you must request one. There is no charge to you for requesting a copy. To facilitate timely delivery please make the request as instructed below before May 31, 2019.

Please visit, where the following materials are available for view:



•  Notice of Annual Meeting of Stockholders

•  Proxy Statement

•  Form of Electronic Proxy Card

•  Annual Report on Form 10-K



TELEPHONE:  888-Proxy-NA (888-776-9962) 718-921-8562 (for international callers)




TO VOTE:          


ONLINE: To access your online proxy card, please visit and follow the on-screen instructions or scan the QR code with your smartphone. You may enter your voting instructions at up until 11:59 PM Eastern Time the day before the cut-off or meeting date.


IN PERSON: You may vote your shares in person by attending the Annual Meeting. Directions to attend the Annual Meeting where you may vote in person can be found under the “Locations” section of the Company’s website at


TELEPHONE: To vote by telephone, please visit to view the materials and to obtain the toll free number to call.


MAIL: You may request a card by following the instructions above.




1.  Election of Directors:


The approval, on a non-binding advisory basis, of the compensation paid to the Company’s named executive officers.



Joanne Bradford

Dale Fuller

Robert Norman




The ratification of the appointment of Deloitte & Touche LLP as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2019.



Please note that you cannot use this notice to vote by mail.