2- Military brown is a dark brown, sort of leather color. I’m not exactly sure what it looks like, maybe someone else knows…
3-chromate green is basically interior green- the same yellowish green as the interiors of just about every WWII US plane. There were variations, though, so check your references.
They have the most complete charts of paint brands with corresponding colors in other brands. Look under the Revell list and see what are the corresponding colors in other brands are.
Write down the site in your notes because it’s very helpful.
The color Rubber isn’t on these charts but they have it. If I might suggest Grimy Black from the Poly Scale line. I use it on all my tires. Looks great.