It is important for all men age 18 through 25 to register for the Selective Service. Name one reason why.

Why this is the answer

The question sets the scene, men age 18 through 25, and asks why registering matters. USCIS accepts three reasons: it is required by law, it is a civic duty, and it makes the draft fair, if a draft is ever needed. Registering and serving are separate things. Service in the U.S. Armed Forces is voluntary, and there is no draft today. When a man registers, he is telling the government that he is available to serve. The study guide states the rule for men who are U.S. citizens or legal permanent residents between the ages of 18 and 26, so it reaches many green card holders as well as citizens. The two phrasings describe the same men: “age 18 through 25” and “between 18 and 26” both end at the 26th birthday. The history shows why the system exists. President Lincoln tried to draft men during the Civil War, and many people became angry and rioted. In 1917 Congress passed the Selective Service Act, which gave President Woodrow Wilson the power to temporarily enlarge the military during World War I. In 1940 President Franklin Roosevelt signed the Selective Training and Service Act, which created the first peacetime draft and was the beginning of today’s Selective Service System. The draft was used again for the Korean and Vietnam Wars. Having that list ready ahead of time is the idea behind the official answer about making a draft fair if one is ever needed. “Makes the draft fair” is the answer that shows you understand the purpose, and “required by law” is the shortest. A mistake to avoid is treating registration as enlisting, for example answering “to join the army.” Joining the military is a voluntary choice, and registration commits no one to it. If you remember the age window and the word fair, you have both halves: register from age 18 through 25, the window the question itself names, so that any future draft would reach everyone on the same terms.