Like a lot of news sites, you have picked up on this when the contractor issued a statement on their involvement.

There are four contractor teams involved in this - not just Boeing.

According to DARPA, contracts are being awarded to:
• The Boeing Co., Huntington Beach, Calif., teamed with L3 Communications,
Millennium Space Systems, Octant Technologies, and Science Applications
International Corp. ($12,891,049);
• Lockheed Martin Space Systems Co., Palo Alto, Calif., teamed with Aurora Flight
Sciences, Colbaugh & Heinsheimer Consulting, Vanderbilt University, and Lockheed
Martin Integrated and Global Systems ($5,762,781);
• Northrop Grumman Space & Mission Systems Corp., Redondo Beach, Calif., teamed
with Alliant Tech Systems Inc., Aurora Flight Sciences, Juniper Networks, L3
Communications, BAE Systems, Cornell University, Jet Propulsion Laboratory,
Massachusetts Institute of Technology, University of Southern California, and
University of Virginia ($6,159,866); and
• Orbital Sciences Corp., Dulles, Va., teamed with IBM, Jet Propulsion Laboratory,
Georgia Institute of Technology, SpaceDev, and Aurora Flight Sciences
($13,648,758).

Modular means redundant. That translates into security and it's attendent peace of mind. The destruction by another nation of a critical satallite could , and most likely would lead to war. The flexibility offerd by redundant satallites could mean the diference between war and a strong diplomatic protest.