Answer:
The selective service could require women to register if there was a war that required an increase in troops, or the occupation of certain specific positions.
Step-by-step explanation:
As we know, women are not required to carry out military conscription and, therefore, are not recruited into the army, however there are situations in which women can be called up required in the army. This happened, for example, in the second world war, when it was necessary for women to occupy certain positions on the battlefield, such as nurses, drivers, mechanics, among others. This happened mainly in England, where only women with deponent children were exempt from the summons.
In other words, we can say that the Selective Service would summon women in a war situation, where they were absolutely necessary.