Hey Phil!
Blackhawk main and tail rotor blades come from the factory satin black. It is very rare to see green blades in service now. The strip that chopperfan refers to runs from the tip to about 3/4 span. I can try to get exact specs if anyoue would like. Here in the desert, the entire leading edge is covered with a polyurethane strip from the bend at th tip to about the 3/4 mark( measurements anyone?). Some crews even paint the metal edge of the tip cap to help reduce erosion of the blades. The components of the main rotor hub and tail rotor hub may be black or green, so check photos of your subject.
For the rest of the plane, testor Army Helo Green is a great starting point. Is is a very close match for fresh paint (Ours were all repainted last year).
I will try to get pics to folks in a few weeks when I am home on leave if you would like. I try to check in here weekly and enjoy questions. If I don't know the answer, I will make up something that sounds good.