You should appreciate veterans.
Dave just came from overseas, and Andy sees him in his full uniform at the airport.
Andy wants to say something to Dave.
Andy tells Dave that he knows how hard it must've been for him serving overseas.
Andy asks Dave how many drones he flew at little children.
Dave likes that Andy understands his perspective and feels valuable.
Dave feels disrespected and is unhappy that he's being judged for the actions of a few.