That's just one of the episodes in Dadland: A Journey into Uncharted Territory.
The book tells the story of his war and his peace, which wasn't all that peaceful. He had a lot of trouble settling into civilian life. The qualities that made him indispensable in a fight could make him a liability in a business. It's also an exploration of family with all its fascinating complexities. Most of all it's a really moving portrait of a former superman slipping into dementia.
They say what makes men cry at the cinema is sacrifice. Stiff upper lip as well. There's a scene here where she takes him to a Jedburgh reunion. His dementia is so advanced that he picks meat off his plate with his hands at the formal dinner and shoves it in his jacket pockets for his dogs. His old radio operator, who jumped out of a plane with him into the darkness over occupied France sixty years earlier, pretends not to notice.