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The initial period of Marine Corps Boot Camp is called the Receiving Phase, which begins as the new recruits are on the bus en route to their recruit Depot. They are greeted by a drill instructor, who acquaints them with the Uniform Code of Military Justice, to which they are now subject. Disembarking from the bus, they line up on the famous "yellow footprints", which is their first formation and learn how to stand at attention. Phase One lasts approximately four weeks. Here, discipline will begin to be instilled in recruits by disorienting them and effectively cutting them off from civilian habits and mindsets, as well as reinforcing the mental and physical standards needed to perform under stressful situations that will be simulated in subsequent phases, and experienced in combat situations. Recruits are required to learn and strictly use language and terminology typical to the Marine Corps, often derived from naval terminology. The bulk of first-phase education consists of classes about the Marine Corps and its history and culture, first aid, rank structure and insignia, protocol, customs and courtesies, the 11 General Orders, aspects of the five paragraph order, prepare equipment for use (such as how to properly make a rack), regulations regarding uniforms, and other topics. Recruits learn through the use of rote memorization and mnemonics; recruits are expected to be able to recite a passage or quote in unison, without error, and on demand. Recruits begin work toward earning their tan belt in the Marine Corps Martial Arts Program. Physical fitness gradually becomes more and more intense as recruits begin to get stronger and their bodies accustomed to the strain. Recruits undergo the first of their conditioning marches, which will grow in length. Periodic fitness tests assess which recruits need more attention, and those who consistently fail to meet the minimum are in danger of being sent to the PCP. Recruits will conduct two pugil stick bouts and are introduced to the obstacle course. Phase Two of recruit training is an introduction to field skills, and includes two weeks of marksmanship training, a field week, and "Team Week". In the first week of the second phase, recruits are taught swimming and water survival. This is the first event where failure to pass will result in a recruit being dropped to a different company to restart training and attempt to qualify again. If a recruit fails twice, he or she will be evaluated to see if a third chance is warranted, or if the recruit will be deemed unable to qualify and administratively separated from service. The second week is known as "Grass Week". This week is partly spent in a class setting to learn about marksmanship principles of the M16A2 and how to shoot efficiently. When not in class, recruits are snapping in, or practicing their firing positions. Recruits are taught how to shoot by a Primary Marksmanship Instructor, a Marine of the MOS 0931. While range personnel wear campaign covers similar to drill instructors, PMIs are not drill instructors and generally not as strict in enforcing discipline upon recruits, focusing on marksmanship and expecting recruits to uphold their own discipline. After the rifle range, recruits begin Team Week. During this week, recruits are placed in various service jobs around the depot, such as yard work, cleaning, maintenance, etc. During this week, recruits will be able to revisit previous instruction and retake tests. Recruits that need to have medical or dental needs addressed, such as the extraction of wisdom teeth, have those procedures done here so that recovery time impacts training as little as possible. Recruits are also fitted for their service and dress uniforms. Phase Three is essentially the 'polishing' of the recruits, when their skills and knowledge are honed and tested. Third phase begins with A-line, where recruits learn to fire their rifle under more realistic combat conditions, such as unknown distances, at night, and wearing a gas mask. The next week sees recruits at Basic Warrior Training (BWT), where they learn the fundamentals of combat and will sleep in the field and eat MREs. Skills taught include camouflage, low crawling, land navigation, basic squad tactics, rapelling, and other foundations of military skills. BWT ends with the gas chamber, where recruits must don and clear their gas mask while exposed to CS gas, in order to be confident in its use in case of exposure to a lethal agent. Recruits who attempt to flee from the chamber before finishing or refuse to enter are dropped. The Crucible is the final test in recruit training, and represents the culmination of all of the skills and knowledge a Marine should possess. Designed in 1996[11] to emphasize the importance of teamwork in overcoming adversity, the Crucible is a rigorous 54-hour field training exercise demanding the application of everything a recruit has learned until that point in recruit training