@Holley
Actually I think the game your looking for sounds to me more like SilkWorm and not SWIV (SilkWorm 4) but then again you said it was a vertical shooter. Silkworm part1 is a horizontal left to right shooter but better than SWIV I think...yu controlled a Helicopter and a Jeep...........this was an arcade game at one time. it was great. Made by TECMO I think...there is no such thing as Silkworm 2, or 3.for some reason they just jumped to IV, maybe to make it look like this game is so good that we are up to part 4! yeah right!
