The Defense Secretary concluded his two-day domestic trip with a speech at Fort Bliss, Texas.
The soldier was on emergency leave back home.
The first tweet read: “AMERICAN SOLDIERS, WE ARE COMING, WATCH YOUR BACK. ISIS.”
White House spokesman Josh Earnest cautioned that there is “a pretty significant difference between a large data breach and the hacking of a Twitter account.”
The Defense Secretary will make a speech at Ft. Bliss, but will not visit the on-base clinic where a gunman allegedly shot and killed a doctor and himself this week.
The bombing campaign began in August.
The Slovak Republic is one of 60 coalition nations fighting ISIL in Operation Inherent Resolve
15 U.S. military sites will be returned to their host nations
The Defense Secretary issued the following statement.
The list includes 673 ISIL fighting positions.