chapter 15

the characters in chapter 15 are the same as before. the chapter starts out by henry having the yellow envelope of wilson. it has the letter he wrote to his family, and henry is suppose to give it to wilsons family if he gets killed. henry was going to talk to wilson about it so he called his name, but then decided not to talk about it, so he change the subject. it seems henry is getting to be good at changing the subject. my question is why does wilson think he is going to die or is the letter just in case and what would happen if henry was killed?