Khaki paint,

Khaki in itself is not a color, it can range anywhere from beige to dark olive green, its like saying "green"...or "brown".
You need to check your references and find a federal standard number (or ANA, RLM etc.) Once you get a proper color number you can find equivalency charts over the internet and some include cross-reference charts and mixing information.
Dont rely on instruction sheets that merely call that color Khaki. Olive drab is another example. The olive drab of a paint manufacturer can differ from anothers and many kit instructions are imprecise in their color callouts and often the round corners in that respect. To get accurate results, a color number must be found through research and reference matérials or through helpful fellow modelers on forums such as this one.
Be sure to state what aircraft, armor or whatever model you are working on and to specify which color scheme you want to do.

Regards,

Jimmy Cancino
Valleyfield, Quebec, Canada

you can lighten olive drab with white and grays and get a wide range of khaki colors. if you dont have olive drab, you can mix mostly yellow and a touch of black (be careful with the darker color when mixing because it is very easy to add too much dark to begin with). what i do is put like 3 or 4 drops of yellow in your mixing container, then, using a piece of bent coat hanger or copper wire (bend a hook shape into the mixing end) i stir the flat black until properly stirred, and just let a drop fall off the stir stick into the yellow. clean all excess black off the stir stick and mix until the desired shade appears. black and yellow is going to produce a range of olive drabs that will then need to be lightened with white and grays. the gray is going to give it the correct tone. beware of using too much white as well or its going to look "frosted". stick with the yellows to lighten the olive drab as much as possible, but you do need a little white. and remember, the color in the mixing container is going to dry to a shade or so darker. later.

Gasser, I purchased a book at my LHS titled AIRBRUSH PAINTING TECHNIQUES by Osprey Modelling Manuals #6 $17.95 It wasn't really what I wanted except the colour and airbrushing chapter. Great colour pictures of the different mixes you can use to get the colour you want. This may help you.

Thanks for the help guys, learn something everyday...
http://dictionary.reference.com/search?q=khaki
Gasser