Jackson took over command of No. 75 Squadron after his brother was killed in action on 28 April 1942, leading it in the Battle of Milne Bay later that year. Credited with a fifth aerial victory, he became the RAAF's first ace in the New Guinea campaign, and was awarded the Distinguished Flying Cross (DFC). By 1944, Jackson was wing leader of No. 78 (Fighter) Wing in Western New Guinea, gaining promotion to wing commander in September that year. Awarded a bar to his DFC in March 1945, he served as chief flying instructor at No. 8 Operational Training Unit in Australia, and saw out the war as commander of Air Defence Headquarters, Madang. After leaving the RAAF in 1946, Jackson returned to the business world, running two garages. He died in Southport, Queensland, in 1980.