“P-47 Canopies” from Pilot Training Manual for the Thunderbolt P-47, AAF Manual 50-5, Headquarters AAF. Top: The streamlined version used in combat affords 360 degrees of vision. Utilize every single degree in scanning the sky for an enemy. Bottom: The old-style “greenhouse,” used in training. While under this canopy, develop the “swivel-neck” that’ll prevent unpleasant surprises later.