Winslow coming to McQueen and getting him to open up about his past, including talking about the wife that left him when she couldn't handle the stigma of being with an InVitro.
When McQueen kills Chiggy Von Richtofen, he yells Winslow's name in memory of her.
Related to the second point above? McQueen is escorted to his fighter by the Wild Cards under his command, while they're in full dress uniform for Winslow's funeral. It shows exactly how much the squad cares about their CO.
When Vansen passes out presents in "The River of Stars" — she bought them at the PX, so everyone gets engraved knives and socks as presents.