 In 2008, Johnson competed in The Hessian Trophy; after shooting 600 out of 600 along with four other shooters, he shot a final score of 105.8 to win.Later that year, Johnson represented his country in the 2008 Summer Paralympics in Beijing.Johnson secured a bronze medal in the Mixed R4-10 m air rifle standing SH2 with a score of 701.2 after a shoot-off with South Korean shooter Ho-Gyoung You.