There's NO Substitute for Marksmanship! Training Booklet, US Navy 1942
This is an original WWII-era training booklet published by the US Navy's Aviation Training Division in 1942. This 18-page, comic-book-style booklet was intended to sensitize pilots regarding marksmanship in fixed gunnery.
The 7 inch by 9 inch booklet is in very good condition given its age.