Made a slight mistake thus making this a useless post.
Previous post text:
If you haven't noticed yet, any units that will be required at a call will have a green box around the tick box. This indicates the units the call requires but does not specify the amount, for that you will still need to check out the mission requirements. This appears to just be added fairly recently, persumably in the last 1-2 hours. This feature is now live, and hopefully will stay live.
You can see an example of how it is displayed attached (mobile version):