Ray making the decision to kill Ogilvy is a pivotal moment for him. It says a lot about how far he'll go to keep Rachel safe.
Ray: Do you understand what I'm going to have to do? I can't let my daughter die because of you.
Rachel also gets one simply for keeping herself calm and making it all the way through her lullaby. Given how terrified she must have been, that's pretty impressive.
Ray sends a FUCKING HAND GRENADE into the alien's tripod after being captured, by exploiting their method of selecting humans for draining.
The Marines on the hill deserve a mention here. Although they get their collective asses handed to them hard. They still stand their ground to try and delay the advance of the Tripods until the civilians can get away. It also counts as a bit of Hearwarming because these Marines KNEW that from the moment they made contact, they weren't going to survive this fight.