The 3rd Infantry Division (3ID) (nicknamed Rock of the Marne) is a combined arms division of the United States Army based at Fort Stewart, Georgia. It is a subordinate unit of the XVIII Airborne Corps under U.S. Army Forces Command. Its current organization includes a division headquarters and headquarters battalion, two armored brigade combat teams, one aviation brigade, a division artillery, a sustainment brigade and a combat sustainment support battalion along with a maneuver enhancement brigade. The division has a distinguished history, having seen active service in World War I, World War II, the Korean War, and the Global War on Terror. The Medal of Honor has been awarded to 61 members of the 3rd Infantry Division, making the division the most honored in the Army.

The division fought in France in World War I. In World War II, it landed with General Patton's task force in a contested amphibious landing on the coast of Morocco, North Africa, overwhelming Vichy French defenders in November 1942. In 1943, the division invaded Sicily in July, and invaded Italy at Salerno in September, before fighting in France and finally Germany. Medal of Honor recipient Audie Murphy, featured in the Hollywood movie, "To Hell and Back," was a member. The division also served in the Korean War. From 1957 until 1996, the division was a major part of the United States Army's presence in the NATO alliance in West Germany.