Yes, it’s from the Doolittle raiders book.If you read "Thirty Seconds Over Tokyo," or any of the books on the Doolittle Raid, you'll find talk of that airman being an extraordinarily large man.
Ouch. Big guy. Regardless of his height, he looks bigger then a 40. Especially when that’s closer to a modern 38.
Two different people - Silver Surfer's referring to Jimmy Stewart the actor, who served in the European theater (8th AF) and was pretty lanky. Here's a picture:
Jimmy's jacket looks well-fitted compared to that Doolittle Raider's.