I'm afraid you have to be MUCH more specific on what tank, plane, or helo you are referring to! Also, make your subject "colors" more descriptive to generate more hits and responses.
I can probably help you out a little however:
-US Navy Aircraft vary per squadron and plane- a lot of information is out there on the F-14 & F-18, research each squadron.
-US Army/Airforce aircraft used where primarily the F-15E in it's Gunship Grey scheme, A-10A (in two-tone grey), F-117 (Stealth Fighter) in it's trademark black, B-1b, B-52, B-2 bombers all wore unique patterns to thier craft.
-check out this months FSM for an article on the M-1A Abrams tank
Hope this is a litttle help to get you sarted.
"I love modeling- it keeps me in the cool, dark, and damp basement where I belong"
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1/48th Hasegawa F-14D- 25%
1/48th Tamiya Spitfire- 25%