WATCH|| Officer Candidate School Ruck March Training Ruck march, also known as a forced march or foot march, is a military training exercise that involves marching long distances while carrying a heavy backpack or rucksack. The term "rucksack" is derived from German words “Rucken” meaning “back” and sack meaning “bag” or pack. In Officer Candidate School, ruck march plays an integral part on the physical development of each Officer Candidates designed to develop physical endurance, mental toughn