A 20-year sentence and lifetime supervision will deter Robert Lorenzo Hester, Jr. and others like him from from the "clarion call" of the Islamic State, federal prosecutors wrote in a memorandum seeking the maximum penalty for a Columbia man who pleaded guilty to aiding terrorists.

In opposition to the long sentence, defense attorneys for the 28-year-old who plotted to attack transportation services in Kansas City and other acts over the course of several months argue mental health issues combined with a mockery of his race and intellect by fellow soldiers led him to extremists ideologies.

Hester pleaded guilty in September before U.S. District Judge Greg Kays and will be sentenced March 4 in Kansas City. Discharged from the U.S. Army shortly after basic training in 2013, Hester over the next several years turned to Islamic extremism, eventually preparing to wage war against the United States.

Read more: Stars & Stripes