One. Four. Five.

You joined the army. 

You went on tour.

You survived. 

You come back. 

Time has passed. Similar to any other situation where you are leaving a certain place with history, your memory of the place will always stay as it was when you left. Things have changed. People have changed. You don't really fit in anymore. But you reason with yourself that its okay, you went away for a purpose, it was all worth it. 

Then this nutcase come along and says that you should have stayed here, that you should not have left. You were mistaken about the purpose, there is none. All you did was worthless.