Spc. James J. Williams of the 3rd Sustainment Brigade, 3rd Infantry Brigade was detained on post Tuesday as a cooperative investigation by the Army and McIntosh Sheriff's Office continued in the case.
Williams hadn't been charged with any crimes, Fort Stewart spokesman Kevin Larson said. He is an electronics technician assigned to the unit since June 2008.
The Army said it has identified Williams as the suspect who drove a motorcycle at speeds deputies said reached 100 mph in the chase that began Saturday afternoon on the post. Pursuit began when military police attempted to stop Williams for speeding and reckless driving, Larson said.
Williams drove off post and turned onto I-95 where police from several agencies gave chase.
In McIntosh County deputies pursuing Williams crashed, totaling four police cruisers and blocking I-95 traffic.