1 Why does the government require qualified 18-year-old males to register for selective service?

Explanation:

Almost all men age 18-25 who are U.S. citizens or are immigrants living in the U.S. are required to be registered with Selective Service. U.S. law calls for citizens to register within 30 days of turning 18 and immigrants to register within 30 days of arriving in the U.S.

this is a good question! i'll do some research and come back when i have the answer!