Bodie - that lists on the Revell color chart as Olive Grey... I think what you need is #361 and then flat coat it. I don't see a matt Olive green listed in Revell colors.. just a satin matt.... here's a listing of the Revell colors and you can see which ones might fit what you want...
http://www.themodelmakersresource.co.uk/catpages/page245.html
good luck to you!!! if you have other brands available to you then maybe you can find it with them!