YES, QUEEN LIZ WAS A TRUCK MECHANIC IN THE WAR "By February 1945, the war was still raging, and Elizabeth had turned 18. At her own insistence, according to the Royal Collection Trust, she joined the Auxiliary Territorial Service as a subaltern and trained as a truck mechanic and driver."

YES, QUEEN LIZ WAS A TRUCK MECHANIC IN THE WAR   "By February 1945, the war was still raging, and Elizabeth had turned 18. At her own insistence, according to the Royal Collection Trust, she joined the Auxiliary Territorial Service as a subaltern and trained as a truck mechanic and driver."

https://www.washingtonpost.com/history/2019/06/04/trump-said-queen-elizabeth-was-mechanic-during-wwii-is-that-real/