When writing missions or creating addons it's often a good idea to have real-live references to work from.

Here are some of the sites that can serve for 'inspiration':

military-meshes.com requires registration to see screenshots.

Google Earth

Iraq Maps

ArmyRecognition
Australian Army Videos
Defence talk's pictures Gary's olive drab page Globalsecurity.org
Jane´s Armour and Artillery requires registration
Jedsite requires registration
Military.com
Military acronyms on Wikipedia
MilitaryMorons.com
MilitaryPhotos.net
Olive Drab
US Army Videos

The Blueprints.com
Suurland.com
Leander's blueprint heaven

Army Field Manuals
Communication Procedures
Radio Procedures
U.S. Marine Corps Training Manuals
United States Military Rank, Pay Grades & Insignia

DeicideNBF's Gallery
Security Arms' Gallery
World.Guns.ru
World of Heckler & Koch (HK)
SigArms (switzerland)

PrimePortal.net
Tanxheaven.com

FAS' Guide to U.S. Land Warfare Systems
FAS' Guide to U.S. Navy Ships
FAS' Guide to U.S. Navy Shipboard Combat Systems
FAS' Guide to Non-U.S. Land Combat Systems
FAS' Guide to Non-U.S. Naval Forces
Prime Portal
Motorfahrer

Aircraft Resource Center
FAS' Guide to U.S. Aircraft
FAS' Guide to U.S. Aircraft Equipment
FAS' Guide to Non-U.S. Aircraft
FAS' Guide to Non-U.S. Missile Systems
Prime Portal
Exotic Planes
Society of Wild Weasels
F-4 Phantom pics