Very simple. If you earned the Objectively Correct Medal AND lost the game. Before it was the Unsung Hero my most frustrating rewarding medal until this week. The Unsung Hero in IB control is great because it means more points per kill. It does not matter who gets the kill because is a team game and the game is control. The more your fireteam holds and controls the zones, the more points each kill and adding points (assists, head shots, ability kills, etc.) will bring to your team. Losing a game and getting the Objectively Correct medal is just the salty touch on the wound when you witnessed your team all spread out, rushing towards the other team's spawning zone, getting gang banged on your own spawning zone, getting control of B and not guarding it. But it tells you that you know what you are doing in IB Control so the problem is the others. After the game ends, I usually leave back to orbit and match make a new IB. What do you do, feel and think when you receive the Objectively Correct medal but lose the game?
I make a habit of trying to get a minimum of 5 captures a match.