A former Osean Air Defense Force pilot, Johnson accompanied former president Vincent Harling during his tour around the International Space Elevator. At the outbreak of the Lighthouse War, he hid the ex-president within the facility.
On June 6, 2019, the IUN initiated Operation Lighthouse Keeper with the intent of rescuing both Johnson and Harling. After the Sea Goblin rescue team was killed in action, he commandeered an Erusean V-22 with Harling aboard and attempted to flee the airspace. The craft was later hit by a missile fired from an MQ-101, injuring him in the process. Johnson soon bled out and died.