USS McCook (DD-496), a Gleaves-class destroyer, was the second ship of the United States Navy to be named for Commander Roderick S. McCook (1839–1886), who was an officer in the Union Navy during the American Civil War.
On 5 June, McCook departed with Destroyer Squadron 18 (DesRon 18) and ships of Assault Force "O" for the coast of France. Early 6 June, under the command of Lieutenant Commander Ralph Lester Ramey she arrived in the Baie de la Seine and at 03:20 commenced bombardment of the beaches and waterfront of the Pointe du Hoc–Vierville-sur-Mer area. By 06:16 she had neutralized her assigned targets (three pillboxes, 13 machine gun nests and three shore guns) and had begun to take on targets of opportunity. By the end of the day, she had added to her score seven pillboxes, eight gun emplacements and ten stone houses, in which enemy machine guns and snipers had been placed.
Resupplying and fueling at Portland and Plymouth, McCook continued to operate in the invasion area until 14 July. Four days later she was en route to Bizerte screening a convoy of LSTs and infantry landing craft. She delivered her charges on 28 July and steamed to Mers-el-Kebir, where she remained until 4 August. She then sailed to Naples to join the forces assembling for Operation Anvil, the invasion of southern France. On 13 August she sailed for France, arriving on 14 August to take up a screening position south of Toulon. For the next 35 days she remained in the assault area providing gunfire support and screen protection to the Allied combatants and to the supply and reinforcement convoys from Corsica and Naples.