The U.S. military is currently an all-volunteer force.
If you receive such a text, do not reply or click any links. You can report the scam to the U.S. Army Recruiting Command or your local law enforcement. Army Recruiting: Text messages about a draft are fake Battle Army
The Selective Service System —not the Army itself—is the agency responsible for managing draft registration. Battle Army
Official U.S. Army recruiters may use text messages for general outreach, but they will never demand you report for a draft or threaten you with jail time. Battle Army