On D-Day, IX Troop Carrier Command units flew over 2000 sorties conducting combat parachute jumps and glider landings as part of American airborne landings in Normandy of Operation Neptune. Other Ninth Air Force units carried out massive air attacks with P-51 Mustang, P-47 Thunderbolt fighter-bombers, North American B-25 Mitchell and Martin B-26 Marauder medium bombers. Air cover during the morning amphibious assault by Allied forces on the beaches of France was flown by P-38 Lightnings.