If you wish to set a vehicle image for a single vehicle, make sure you don't have any graphic packs set. Then you'll need to navigate to your vehicle and choose the pencil icon. You can then choose the image you want with/without lights by choosing the "choose file" button. Then just find your image you want to use.
As for the projected mission, I also have no clue what it is. I think the log shows classes but I'm not sure on that. I'm definitely sure that the shows hospital expansions.
Hopefully I explained that well.