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.

J. Douglas Harvey was born in Toronto and served for twenty-two years in the Royal Canadian Airforce (RCAF). He is a graduate of the University of Toronto and holds the distinguished Flying Cross and Canadian Forces Decoration.

He was director of Public Relations for the RCAF when he resigned in 1965 with the rank of Wing Commander. Prior to his retirement, he was also General Manager of the RCAF Association. Harvey is the author of Boys, Bombs and Brussel Sprouts, The Tumbling Mirth and Laughter-Silvered Wings, and founding editor of Airforce magazine. J. Douglas Harvey died in January 1998.