He’s so impulsive and angry; is Lt. Dan an Eight? An Eight, a Body Type, who loses part of his physical ability would have a difficult recovery.
What if Dan is a Heart Type, though? It’s a joke in the movie that Dan’s every ancestor has died in war, and Dan expects the same fate. A Four would feel pretty pissed off at getting cheated out of a glorious death.
Dan is more emotionally volatile than an Eight would be. “You call this a storm?!” He loves this conflict, this fight between his will and nature’s. It’s not about physical power, though. An Eight would ask for his body to be changed; for Dan, his heart needs to change. Until this moment he’s dominated by depression and can’t move forward with his life.
I also like him as a Four because he is another Heart Type companion for Forrest Gump. It’s consistent.