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

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. 

a direct vote in which an entire electorate is invited to vote on a particular proposal. this may result in the adoption of a new law.