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.
"United States Official Army Draft, we tried contacting you through mail several times and have had no response. You have been marked eligible and must report in. Failure to respond may result in a fine and a minimum jail sentence of six years." Key Facts to Know Battle Army
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 Official U
The U.S. military is currently an all-volunteer force. Battle Army