April 11
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1914 - Margaret C. MacDonald is appointed Matron-in-Chief of the Canadian Nursing service band.
- She becomes the first woman in the British Empire to reach the rank of Major.
- She becomes the first woman in the British Empire to reach the rank of Major.
1970 - Apollo 13 is launched, suffering an explosion in its SM oxygen tanks. Its moon landing is aborted, and the crew returns safely after several days in space.