Modem Will be Key Component in Modernization Program for
     Ground Network to Support Enhanced Teleport Architecture

BETHESDA, Md., Dec. 16, 2009 (GLOBE NEWSWIRE) -- Iridium Communications
Inc. (Nasdaq:IRDM) has awarded a contract to Integral Systems, Inc.'s
(Nasdaq:ISYS) subsidiary, RT Logic (www.rtlogic.com) for the
development of a software-defined modem (SDM) for the new feeder link
terminals (FLT) to be deployed at Iridium ground stations.

"The new modem will be a critical component in our ground network
modernization program, which will be based on a state-of-the-art
teleport network architecture," said John Roddy, executive vice
president of ground operations and product development, Iridium. "We
selected RT Logic to supply this critical component because of its
extensive technical expertise as a supplier of commercial off-the-shelf
(COTS) SDMs for low-earth orbiting satellite applications."

"The new teleport network architecture with FLTs at multiple locations
will strengthen Iridium's network reliability even further beyond
today's high levels, provide new layers of built-in redundancy for our
existing satellite constellation, and be an integral part of the
teleport network architecture that will be the backbone of Iridium
NEXT, our next-generation satellite network," Roddy added.

Under the development contract, RT Logic will supply two prototype
modems for on-orbit test and verification. Iridium expects to complete
the development and certification effort by the end of 2010. The SDM
will be based on RT Logic's existing T400XR(R) COTS product.

About Iridium Communications Inc.

Iridium Communications Inc. (www.iridium.com) is the only mobile
satellite service (MSS) company offering coverage over the entire
globe. The Iridium constellation of low-earth orbiting (LEO)
cross-linked satellites provides critical voice and data services for
areas not served by terrestrial communication networks. Iridium serves
commercial markets through a worldwide network of distributors, and
provides services to the U.S. Department of Defense and other U.S. and
international government agencies. The Company's customers represent a
broad spectrum of industry, including maritime, aeronautical,
government/defense, public safety, utilities, oil/gas, mining,
forestry, heavy equipment and transportation. Iridium has launched a
major development program for its next-generation satellite
constellation, Iridium NEXT. The company is headquartered in Bethesda,
Md., U.S.A. and trades on the NASDAQ Global Market under the ticker
symbols IRDM (common stock), IRDMW ($7.00 warrants), IRDMZ ($11.50
warrants) and IRDMU (units).

About Integral Systems

Integral Systems, Inc., of Columbia, Md., applies more than 25 years
experience to provide integrated technology solutions for
SATCOM-interfaced networks. Customers have relied on the Integral
Systems family of companies (Integral Systems, Inc.; Integral Systems
Europe; Lumistar, Inc.; Newpoint Technologies, Inc.; RT Logic; and SAT
Corporation) to deliver on time and on budget for more than 250
satellite missions. Our dedication to customer service has solidified
long-term relationships with the U.S. Air Force, NASA, NOAA, and nearly
every satellite operator in the world. Integral Systems is listed in
Forbes' Top 200 Small Companies in America for 2008. For more
information, visit www.integ.com.


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CONTACT:  Iridium Communications Inc.
          Press Contacts:
          Liz DeCastro
          +1 (301) 571-6257
          liz.decastro@iridium.com 

          Rhodes Communications, Inc.
          Press Contacts:
          Jim Rhodes
          +1 (757) 451-0602
          jrhodes@rhodescomm.com