Filed by Engineered Support Systems, Inc.
                       Pursuant to Rule 425 under the Securities Act of 1933
                                    And Deemed Filed Pursuant to Rule 14a-12
                                            Under the Securities Act of 1934

                           Subject Company: Engineered Support Systems, Inc.
                                               Commission File No. 000-13880

The following letter was distributed to employees of Engineered Support
System, Inc.:

September 22, 2005

To all Engineered Support Systems Employees:

We announced today that we have signed a definitive agreement to be acquired
by DRS Technologies, Inc., a Parsippany, New Jersey-based company that
provides leading edge products and services to defense, government
intelligence and commercial customers. The transaction is expected to close
in the fourth quarter of DRS's fiscal year ending March 31, 2006, subject to
customary regulatory approvals and the approval by both companies'
shareholders.

DRS is a company the Engineered Support Systems community can understand and
appreciate--because DRS shares the same focus on serving the military
customer and providing outstanding shareholder value that all of us have
embraced as keys to our success--and DRS also has enjoyed great success over
its more than 35 years in the defense industry. DRS develops and
manufactures a broad range of mission critical systems that uniquely
positions the company to support the ongoing superiority of the military's
Current Force, as well as the modernization and emerging transformation
initiatives of the Future Force. DRS's high-technology products and services
are used by all branches of the U.S. military, major aerospace and defense
prime contractors, government intelligence agencies, international military
forces, and industrial and homeland defense markets. The company holds
leading market positions in thermal imaging devices, combat display
workstations, electronic sensor systems, power systems, battlefield
digitization systems and deployable flight incident recorders. DRS also
provides communications and surveillance systems, diagnostics and test
systems, and training and simulation systems. The company expected to
generate $1.5 billion in revenue for its fiscal 2006 without any
acquisitions and employs approximately 6,000 people worldwide.

DRS views the addition of the Engineered Support Systems Team--especially
our people--as an exciting and essential leap forward toward a future of
leadership in the military technology and support marketplace. The
combination of our companies represents a new team that is, frankly,
unstoppable. At Engineered Support, our priorities were always aimed at
growth--that's been our company's focus since Mike Shanahan founded the
company some 23 years ago. Growth in the number and capabilities of the
solutions we offer our important customers. Growth in our position in our
marketplace. Growth in opportunity for our employees. And of course, growth
in our financial performance. By joining forces with DRS, we significantly
further our team's efforts on every one of these counts. It's a tremendously
exciting opportunity for all of us.

Many of you will have important questions and concerns in response to this
announcement. To help answer these questions and better inform you on the
process, there will be a series of upcoming communications and updates from
the corporate team, as well as from your subsidiary leadership--face to
face, by email and by Intranet. For more information about DRS, I recommend
you visit the DRS web site at www.drs.com and view the wide variety of
information that can be found there.



                                                                      Page 2


In the coming weeks, the management teams of both Engineered Support Systems
and DRS will create an integration team that will be responsible for
integrating the two organizations and ensuring the acquisition's success.
However, it is very important we all understand and remember that, until the
close of this transaction, we will continue to remain as two separate
businesses serving our market places. The employees on our team are the most
important factor in ensuring a successful transition and the best start
thereafter on the newest phase of our company's future. Please remain
focused on your job, deliver on your commitments and continually exceed our
customers' expectations.

What an exciting time to be part of the Engineered Support Systems Team!
Thanks for your continuing support and your many contributions to the
company.

Sincerely,

/s/ Gerald A. Potthoff

Gerald A. Potthoff

Vice Chairman and CEO
Engineered Support Systems, Inc.