Jeffo,
I will be doing the same thing here in a few weeks. My plan is to put down a base color of tan then streak with Olive Drab. The paint I will be using is latex. I have heard the best method is to use a 1" bristle brush and cut it down using pinking shears. You want to remove at least 1/2 the length of the bristles to make the brush stiffer.

I will be painting some test panels on drywall to practice the streaking on before moving to the plane.

Check in on the 1/3 GTM DRI build in the scale forum. there are some really good tips there for doing the streaking.
Later!!
Anthony