Operational Support Vans or SAR Units

Please provide screenshots clearly showing the 'missing' message, and all units you've sent. This will help to understand your problem and answer your question.

Good question. There is no Operational Support Van unit in-game that I can see from researching the vehicle purchase screens of SAR HQ, Mountain Rescue and Coastguard stations. I was under the impression that there used to be one for SAR HQ buildings but currently only the trailer or Control Vans are showing. Perhaps the devs have accidentally removed the vehicle without removing the requirement for it. Please can you open the mission with this error in a new tab and screenshot the mission ID (within the URL of the tab) so I can feed this back.

From looking at this, it appears that this is a custom alliance mission, and the requirements have been set using the options available in the mission creator.

I can see multiple vehicles sent by yourself are still en-route, please update this thread once they have arrived as to whether the missing units message is still there. It may be that whoever created the mission had set a significantly high number of required vehicles in that category, and you have still not fulfilled it.

mountain rescue is a good idea

Quote from Wolfman1988

mountain rescue is a good idea

Not sure what you're getting at... It's in the UK version of the game already, this is a UK thread, and your comment seems out of place if you mean 'It would be a good idea to send mountain rescue units' as he has clearly already done this. If you want to suggest adding mountain rescue to a different version of the game, this is not an appropriate thread to be starting that discussion.