Exhibit 16.1


December 31, 2001


Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, D.C. 20549

Commissioners:

We have read the statements under the caption "Change in Independent Auditors"
made by ManTech International Corporation (the Company) (copy attached), which
we understand will be filed with the Commission, pursuant to Item 304 of
Regulation S-K, as part of the Company's Registration Statement on Form S-1
dated December 31, 2001. We agree with the statements concerning our Firm under
such caption in the Form S-1.

Very truly yours,

/s/ PricewaterhouseCoopers LLP

PricewaterhouseCoopers LLP




Change in Independent Auditors

         In July 1999, we determined to change our independent auditors from
PricewaterhouseCoopers LLP, to Deloitte & Touche LLP. In connection with
PricewaterhouseCoopers LLP's audits of our financial statements for the years
ended December 31, 1997 and 1998 and through July 1999, there were no
disagreements with PricewaterhouseCoopers LLP on any matter of accounting
principles or practices, financial statement disclosure, or auditing scope or
procedure, nor any reportable events. The reports of PricewaterhouseCoopers LLP
on the financial statements for the years ended December 31, 1997 and 1998
contained no adverse opinion or disclaimer of opinion and were not qualified or
modified as to uncertainty, audit scope or accounting principle. The decision to
change auditors was approved by our board of directors. We have provided
PricewaterhouseCoopers LLP with a copy of the disclosure contained in this
section of this prospectus.