Tumbling Mirth is an anecdotal look at the Royal Canadian Air Force from its origins in 1924 to the time of its unification in 1967. During those years the Air Force was the RCAF, and members were proud to serve their country. The author, Douglas Harvey, served for twenty-two years and Tumbling Mirth is a collection of his stories and tales remembering what it was like to work in the air force, with cartoons drawn by Warrant Officer Ray Tracy.