Early in the war, these aircraft were used primarily to conduct raids and gather intelligence on North Korean ground targets, focused on disrupting North Korean supply to the front lines. However, as soon as UN forces retreated to Pusan Perimeter following the Battle of Taejon, the Naval aircraft were immediately re purposed for close-air support and airstrikes against North Korean ground troops on the front. These missions were significantly more risky and the aircraft suffered much higher losses due to North Korean ground fire. On August 1, Sebille and his squadron moved to Ashiya Air Field and began conducting missions in support of the ground forces in Korea. By August 5, Sebille had accrued over 3,000 hours of flying time over the course of his career. During this time, the 67th Fighter-Bomber Squadron operated primarily out of Ashiya but also used airfields at Taegu and Pusan.