Sweetheart of the Song Tra Bong

This is by far the strangest thing in the book. A guy named Fossie is in love with his highschool sweatheart and she works as a medic in the army. hoever she begans to act wierd and missing on some nights. She likes to go out on patrols at night with no weapon. That itself is crazy but what gets me is that  he cathces her in the speicla forces hut with a leaopard head and human toongues around her neck that is crazy. Its like she has become attached to vietnam and is now part of the war itself. War can somtimes make you mad and in her case this has made her crzy beyond return. How would she adapt back to the new world when she returns home?