The 479th began combat on May 26, flying bomber escort missions and attacking transportation targets in occupied France in advance of the invasion of Normandy. Olds flew a new P-38J Lightning that he nicknamed "Scat II". Olds' crew chief, T/Sgt. Glen A. Wold, said that he showed an immediate interest in aircraft maintenance and learned emergency servicing under Wold. He also insisted his aircraft be waxed to reduce air resistance and helped his maintenance crew carry out their tasks. On July 24 Olds was promoted to captain and became a flight and later squadron leader. Following a low-level bridge-bombing mission to Montmirail, France, on August 14, Olds shot down his first German aircraft, a pair of Focke-Wulf Fw 190s.