The 512th Fighter Squadron played a crucial role in supporting Operation Overlord, the Allied invasion of Normandy on D-Day, June 6, 1944. As part of the 406th Fighter Group, the squadron was equipped with P-47 Thunderbolt aircraft. Their primary missions during this period included providing air cover for the invading forces, conducting bombing and strafing runs on enemy positions, and engaging in aerial combat to maintain air superiority over the beaches and surrounding areas.

On D-Day, the 512th Fighter Squadron was tasked with several key objectives. They flew multiple sorties throughout the day, targeting German fortifications, supply lines, and transportation networks to disrupt enemy reinforcements and communications. The squadron's efforts were vital in suppressing enemy anti-aircraft defenses and providing close air support to the ground troops, which helped to ensure the success of the landings and the establishment of a foothold in Normandy.

The pilots of the 512th Fighter Squadron demonstrated exceptional bravery and skill, contributing significantly to the overall success of Operation Overlord. Their actions helped to pave the way for the subsequent Allied advance into occupied Europe.