Dispatch Mission (Bureau)
Dispatch Missions act as a way of levelling up your men and gaining new technology as they allow you to send them off on another mission without Carter where they are almost guaranteed a level up. You can send as many agents on dispatch missions as long as the overall level is over the required level. Eg. A Dispatch Mission with a level score of 10 can be completed by any amount of soldiers that add up to ten or more, but once it goes to that value you will lose the ability to add more soldiers and only launch the mission.
Any amount of dispatch missions can be launched at once as long as you have the necessary amount of soldiers. (It may be better for you if you have any non-level 5 agents to send them on a dispatch mission.)