Most of the game this hasn't been an issue for me, but for some of those 5 min missions in Powerhouse Alpha, just far enough before I reach the next infirmary, I die and get sent back to the infirmary at the beginning with like 2:00 left on the clock. When that happens, it's quite obvious that I won't be able to complete the mission, but I still have 2 mins to wait to get out of the mission unless I exit the game. The ability to restart the mission or return to base camp would be really helpful in those situations.