From the History Learning Site, "In the army, women joined the Auxiliary Territorial Service (ATS). Like soldiers, they wore a khaki uniform. The recruiting posters were glamorous - some were considered too glamorous by Winston Churchill - and many young ladies joined the ATS because they believed they would lead a life of glamour. They were to be disappointed. Members of the ATS did not get the glamour jobs - they acted as drivers, worked in mess halls where many had to peel potatoes, acted a cleaners and they worked on anti-aircraft guns. But an order by Winston Churchill forbade ATS ladies from actually firing an AA gun as he felt that they would not be able to cope with the knowledge that they might have shot down and killed young German men. His attitude was odd as ATS ladies were allowed to track a plane, fuse the shells and be there when the firing cord was pulled……By July 1942, the ATS had 217,000 women in it. As the war dragged on, women in the ATS were allowed to do more exciting jobs such as become welders (unheard of in ‘civvie’ street), carpenters, electricians etc." From the WW2 Talk Forum a picture of some ATS riders. The two bikes on the right are sidevalve WD/C 350cc Royal Enfields. And here is Her Majesty herself, before she was queen, getting her hands dirty on an ATS vehicle, no news if she ever rode a Royal Enfield!