Sid happily tackling Gene when they are reunited on the island (also a Crowning Moment of Funny when they are 'busted' by Captain Ack-Ack and Hillbilly and react very nervously)
The scene where Gene receives a letter that his dog has died and Snafu tries to comfort him, leaning against his shoulder
Chuckler's gentle "aww, buddy" when he sees that Leckie is sick again
Can we just say Chuckler in general? Though it's more prevalent in Leckie's memoir, he was basically the Team Mom of Leckie's gang, and had more than a few sweet moments when it came to the boys.
John and Lena's wedding, and basically everything about them
Leckie bonding with Stella's family in Melbourne
Sledge cradling the dying woman on Okinawa, instead of mercy-killing her. A bit of a tearjerker as well..
Sid visiting Gene's parents after being shipped home and assuring them (rather untruthfully) that he wasn't worried about Gene's safety because he was with good men
Gene coming home to his parents
Snafu awkwardly thanking a departing Burgie "for doin' all you did to keep us from gettin' our fools heads shot off" on the train home
Leckie and Vera's awkward-but-sweet date once he returns home, especially considering that he married her in real life
Vera: Why me? Why not Rita Hayworth or Betty Grable?
Leckie: Because I know you.
Sid asking Gene to be his best man
Lieutenant Colonel Lewis "Chesty" Puller saluting Basilone when he gets the Medal of Honor (Basilone said in real life that it was one of the proudest moments of his life)
Runner calling Leckie Peaches after they're both injured and brought on the same hospital ship. Also when Leckie starts to get choked up while explaining that he meant to come back for Runner, but couldn't, and Runner tells him that he understands.
Leckie: (tearing up) I tried to get a Corpsman. I tried to get back to you.
Runner: I know. Lucky? (Leckie looks at him) I know.
Captain Ack-Ack admitting that he's comforted by the thought that his father, who manages a textile mill that makes fabric for the Military, had something to do with the blankets he and his men sleep in. Also makes the moment when his dead body is wrapped in a blanket that much more if a Tear Jerker