The Question and Answer section for Fences is a great resource to ask questions, find answers, and discuss the novel.
Troy naturally assumes that Lyons will soon be back for another "loan", it's a bit of a habit for Lyons to come to his father for money. Thus, to prove his point, Troy tells Lyons to put the money in the bank, so he can just go and take it out...
Lyons encourages his brother to stay in the military and take advantage of the early retirement.
From the text:
“Death ain’t nothing but a fastball on the outside corner…That’s all death is to me.”