Combat Lynx

Combat Lynx (at least the spectrum version, I've never seen others) had a couple of interesting features. It was a third-person game, with the helicopter in the centre of the screen, and a fairly complex control set. Among the neat features were a 'projected targeting sight' for air-to-surface missiles that rolled nicely over a set of 'real' 3d hills (I think they were done as contour lines). Pretty advanced stuff in 1984! Gunship didn't even do that!