Well, let's start out by saying JJ IS HOME!! WOOHOO! It was undoubtedly one of the most touching moments of the show when Helen arrives at church, very solemn-looking, and suddenly breaks into a smile and shouts, "he's coming home!" The reactions were fantastic and made me really respect the actors' work so much more.
Another notable moment is when JJ is still in Vietnam and dreams he's seeing his old comrades. You are completely unsure for the whole scene as to whether or not it's real or a dream. Unfortunately, it's a dream, but the scene was done so well that it makes you really think.
Watch this episode! You will NOT regret it.