Learning about her WWII service impressed me a lot.
She didn’t do WWII service, that was a fake thing for publicity and propaganda.
That photo would have been taken during the three week Transportation course she took a short distance from Windsor Castle, largely isolated from others, she enlisted just before turning 19, in March 1945. Hitler killed himself in April.
She was enlisted as 230873 Second Subaltern Elizabeth Alexandra Mary Windsor in the Auxiliary Territorial Service, the ATS, [March, 1945] and sent to train as a transport officer at Camberley. The course was three weeks and Princess Elizabeth did not associate too closely with her fellow trainees.
She lunched in the officers mess and slept the night at Windsor; 50 years later, her grandsons would eat cadet food, iron their own uniforms, polish their own boots and be shouted at on the drill square.
Despite her kid-glove treatment, Princess Elizabeth greatly appreciated her spell in the ATS, believing it gave her a confidence she had previously lacked
The war in Europe was now drawing to a close and on May 8, 1945, the two princesses were allowed out of the Palace with their Guards officer friends to mingle with the crowds in the Mall and join in the shouts of We want the King
The entire WWII experience as a military member for Princess Elizabeth seems to have consisted of weeks when she lived in Windsor Castle, enlisted as a Lieutenant, attended a personalized 3 week course, had some photos taken of her touching trucks, never left living at Windsor castle, was promoted to Captain and was quickly finished with the entire exercise.
She had been a Colonel before.
In keeping with her power and status of high birth, on her 16th birthday she was appointed Colonel of the Grenadier Guards during WWII (during 1942).
The Grenadier Guards training element was stationed at her home, Windsor Castle as security and personal escorts for her.