The 1st Marine Division is the largest unit on active duty in the United States Marine Corps. Nicknamed "the Old Breed," or the "Blue Diamond," the 1st Marine Division is also the most decorated unit of its size in the USMC. The 1st Marine Division is the ground combat element of the I Marine Expeditionary Force (I MEF) and is stationed at Camp Pendleton in California.

History of the 503rd Parachute Infantry Regiment from their time fighting during WWII in the Pacific Theater - which earned them a Presidential Unit Citation - all the way through to their multiple deployments to both Iraq and Afghanistan during the Global War on Terror [GWOT].