Government/Federal:

United States Department of Defense
United States Air Force
United States Army
United States Navy
United States Marine Corps
United States Coast Guard
Joint Chiefs of Staff
Pentagon

Industry:

GovCon
Small Business Administration
Business.gov
GovExec.com

Service Academies:

U.S. Air Force Academy
U.S. Naval Academy
U.S. Military Academy
U.S. Coast Guard Academy
U.S. Merchant Marine Academy

Miscellaneous:

Freedom of Information (FoIA)
Homeland Security
Defend America
e-QIP Gateway