In World War I, the 2d Division included the 4th Marine Brigade, which consisted of the 5th and 6th Marine Regiments. The Navy furnished the hospital corpsmen for the Marine Brigade, and made a special uniform change which allows hospital corpsmen of this organization to wear a shoulder strap on the left shoulder of the "Dress Blues" so that the French Fourragere could be worn. This is the only Navy unit to wear the Fourragere.

After training in Ireland and Wales from October 1943 to June 1944, the 2d Infantry Division crossed the channel to land on Omaha Beach on D plus 1, 7 June 1944, near St. Laurent-sur-Mer. Attacking across the Aure River, the Division liberated Trevieres, 10 June, and proceeded to assault and secure Hill 192, the key enemy strongpoint on the road to St. Lo. With the hill taken 11 July 1944, the Division went on the defensive until 26 July. Exploiting the St. Lo break-through, the 2d Division advanced across the Vire to take Tinchebray 15 August 1944.

The Division then moved west to join the battle for Brest, the heavily defended fortress surrendering 18 September 1944 after a 39-day contest.

The Division took a brief rest 19-26 September before moving to defensive positions at St. Vith. The German Ardennes offensive in mid-December forced the Division to withdraw to defensive positions near Elsenborn, where the German drive was halted. In February 1945 the Division attacked, recapturing lost ground, and seized Gemund, 4 March. Reaching the Rhine 9 March, the 2d advanced south to take Breisig, 10-11 March, and to guard the Remagen bridge, 12-20 March.

The Division crossed the Rhine 21 March and advanced to Hadamar and Limburg, relieving elements of the 9th Armored Division, 28 March. Advancing rapidly in the wake of the 9th Armored, the 2d Division crossed the Weser at Veckerhagen, 6-7 April, captured. Gottingen 8 April, established a bridgehead across the Saale, 14 April, seizing Merseburg on the 15th. On the 18th the Division took Leipzig, mopped up in the area, and outposted the Mulde River; elements which had crossed the river were withdrawn 24 April. Relieved on the Mulde, the 2d moved 200 miles, 1-3 May, to positions along the GermanCzech border near Schonsee and Waldmunchen, and attacked in the general direction of Pilsen, reaching that city as the war in Europe ended.