http://www.nelsonhobby.com/hobby_paint.php
A 1/2 pint of the Olive Drab should do for a smaller model, particularly if you end up adding acrylic to customize the color. I love the Flat Clear and use it on every one of my WWI models so I always order it in the quart size. You'll also need to order one of the small bottles of Cross-linker that makes the paint fuel-proof. If you do a custom mix of PC10 make sure to make more than enough because you'll never manage to match the color in another batch.
I'm an American teaching at a Japanese university. I've been here going on 16 years now.