He got only seconds to express his love to his daughter.
Right after that he must push her away for her own good.
He died in more or less staged situation, as the soldiers he was so eagerly looking for were right there, waiting for his downfall.
Missing Mom makes it even worse, because now Hannah is left entirely alone.
Jim returning home to find his parents having committed suicide. They were sure he couldn't survive being in coma after the infection hit...
Jim- With endless love, we left you sleeping. Now we're sleeping with you.
Don't wake up.
When Selena realises there is no way to escape from being raped, she feeds Hannah with Valium. At first it looks like she's trying to give her a Mercy Kill, which is even lampshaded by the girl and by itself a Tear Jerker. Then Selena explains that she wants her to not care, because she can't bring herself to kill Hannah and was in no position to save her.
Mark's story about how he lost his family. It's even stronger by the fact that till that point he was token optimistic teammate.
"True" ending - Jim just dies in the hospital after failed revival. It's really depressing.
When Sgt. Farrell tires to stop his CO and squad-mates from crossing Moral Event Horizon. He just can't bring himself to shoot his own friends.
And then he's executed by them without a blink of an eye.
Jones' death to this troper. When West calmly and carringly comforts him in his final moments, it's really hard not to feel sorry for the guy when he still tries to explain himself to his commanding officer.
YMMV is in effect here. He's totally cool with gang rape and murder, after all.