Note: I am not responsible for the contents or reliability of the linked web sites and do not necessarily endorse the views expressed within. Listing therefore should not be taken as an endorsement of any kind. I cannot guarantee that all of these links will work all of the time and have no control over availability of the linked sites.  
 

Law enforcement / military & security equipment
http://www.uscav.com
http://www.olive-drab.com
http://www.military.co.uk
http://www.blackhawk.com

Weaponary
http://www.sigarms.ch
http://www.springfield-armory.com
http://www.hecklerkoch-usa.com
http://www.heckler-koch.de

Government
http://www.mod.uk
http://www.mi5.gov.uk
http://www.cia.gov
http://www.fbi.gov

Military
http://www.army.mod.uk
http://www.army.mil

Law enforcement
http://www.scotlandyard.police.uk
http://www.officer.com
http://www.bka.de
http://www.interpol.int/

Media
http://www.bbc.com
http://www.cnn.com

Vehicles
http://www.landrover.com
http://www.stoof-international.com

Magazines
http://www.sofmag.com
http://www.combatandsurvival.com