1. Create a west soldier, rank colonel. In his init field write
deleteVehicle this
Create a civilian. Group the civvy to the west colonel. The civvy now behaves like a west loon.
This forum has a search function. It's not always successful, but it's always worth trying a search before posting. This is by far the most popular question these days so you would have found the answer straightaway.
2. Create a trigger:-
Area: whole map
Activation box: West not present
Type: End#1
I suggest you read some trigger tutorials in the Editors Depot if you're not sure how to make your mission end.