By definition, a crucible is a state of prolonged anguish and privation. As it relates to the making of Marines for the 21st century, it's boot camp's defining moment. This 54 hour event occurring near the end of recruit training features little sleep, little food, over 40 miles of forced marches and 32 stations that test physical toughness and mental agility. It is the final test, a trial by fire, that all must successfully complete before earning the title of Marine.