PRIVATE.
It's different when you're delegating. Lead on a mission that someone else cooked up, easy, you can put the blame on your handler. Put the blame on an intel officer who gave you bad info. Or your partner for not following a protocol. There's always someone else on the food chain that can be blamed.
You took charge on patrols, so you're taking the emotional hits when they don't come back.
Unless you're going to put these people through rigorous training every week, you only have someone's word to go on. Rose has regenerative healing powers, I've watched her come back from the dead. Steve? He's as stubborn as you are.
None of this is your fault, so there's nothing for you to be sorry for.