He earned a Congressional Medal of Honor, when, while under attack, his tank through a track. Sergeant Johnson left his tank, armed only with a 45, opened fire, and proceeded to pull wounded soldiers from tanks. Although he did, for a short time have access to a larger weapon, the majority of the fight was fought (and won) with a 45.
Sergeant Johnson struggled after returning to civilian life, and on April 30, 1971, he was shot and killed during a convenience store robbery (there are some questions about his involvement) and rests in Arlington Cemetery.
Sergeant Johnson's story is immortalized in two plays. Strike Heaven on the Face by Richard Wesley and The Medal of Honor Ring by Tom Cole.