Question

what larger shift was indicated by women beginning to serve as secretaries and radio operators in the us navy

Answer 1

I found these choices on the internet:
Women were starting to take on more involved roles.
The navy was removing women from active combat.
Military leaders were beginning to put women in command.
More women than men were serving in the military.

The answer would be Women were starting to take on more involved roles.

Women roles quickly change because of the war. More than 100,000 women worked in the Women's Army Corps during World War II, which later became recognized as the Women’s Army Corps. Women also participated in the United States Navy.