The RCAF got its roots in 1918 as the Royal Army Flying Corps, which had three primary purposes: artillery spotting, transportation of high-value messages, and dropping propaganda leaflets on enemy troops. The dropping of propaganda leaflets was very quickly changed into the dropping of grenades into enemy trenches, and so the CRAF's mission of tactical bombing is therefore it's first and foremost combat role. The RCAF refers to fighter aircraft as "Hunters" rather than as "Fighters".