In the Navy, an AB is an Able Seamen.
Maybe some further context of what you're looking for might help others in finding an answer for you. Are you asking about Army ranks or ranks for another Service? Female or male service member? The details of the person's service would help too. I'm assuming the time period is the Second World War.
The more information you can provide, the better the chances are of someone being able to help you find your answer.
Cheers,
Dan.
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