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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':
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
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)
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