I've roughly drawn up a twin missle bay to demonstrate:
1.Condition state: green - no target set.
![Image](http://i487.photobucket.com/albums/rr237/gogz69_01/doors_closed.png)
2.Condition state: yellow/red - missile armed/locked.
![Image](http://i487.photobucket.com/albums/rr237/gogz69_01/doors_open.png)
3.Condition state: 1 missile launched.
![Image](http://i487.photobucket.com/albums/rr237/gogz69_01/x1_missile.png)
4.Conditon state: all missiles launched.
![Image](http://i487.photobucket.com/albums/rr237/gogz69_01/x0_missile.png)
Of course, there are many combinations that could be used.