This thread is based purely on looks. I'll list items, which look the most futuristic, and therefore coolest IMO. Add your own opinions and other types of military hardware which I forgot/was too lazy to list
Shoulder-launched Anti-Armor
PREDATOR, USA
Armored Fighting Vehicles
ACV-S, TURKEY
Jeep-like vehicles
COBRA, TURKEY
SHADOW RST-V, USA
FENNEK, GERMANY
Artillery
MLRS, USA MARS, GERMANY LRM, FRANCE (Spot the difference

I sure can't)
CRUSADER, USA
Attack Helicpoters
RAH-66 COMANCHE, USA
Main Battle Tanks
LECLERC, FRANCE
Check out the wicked-looking machine-gun on the back of the turret
http://www.army-technology.com/proje.../leclerc1.html
Support Helicopters
AS 565 PANTHER, EUROPE
CH-47D CHINOOK, USA
Unmanned Aerial Vehicles
PREDATOR, USA
TAIFUN, GERMANY
GLOBAL HAWK, USA
Assault Rifles
XM-8, USA
PAPOP, FRANCE
Submachine Guns
P90, BElGIUM
Hand Guns
Five-seveN, BELGIUM
Shotguns
USAS-12, SOUTH KOREA
Sniper Rifles
AW-50, UNITED KINGDOM
Machine Guns
MINIMI/M249, BELGIUM/USA
OCSW, USA
Fighters Ground Attack
F-117 NIGHTHAWK, USA
F/A-22 RAPTOR, USA
JSF F35, INTERNATIONAL
DRAKEN, SWEDEN
Long Range Bombers
B-1B LANCER, USA
B-2 SPIRIT, USA