A history of the WAAFs can be found on the WAAF Association website: link here
Here are some pictures:
WAAF Recruiting Poster in WWII
WAAF Radar Plotters in WWII
The popular image of WAAFs places them either in radio control rooms or radar installations (as in the picture above). Jane Duncan (and Janet) also started her wartime experiences on an airbase, although soon thereafter moved to Bletchley Park in Buckinghamshire (Station X). More on that later...