Boot camp is a thirteen week cycle of training, beginning with a receiving phase of in-processing or "forming", followed by three numbered phases. Each phase includes intensive education and training on various topics essential for military life. Each phase consists of a predetermined number of training days, these are counted in the training matrix as "T1", "T2", up to "T70" which is Graduation Day.

US Marine Corps Training: Receiving Phase

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.

The recruits are given the opportunity to phone their next of kin and inform them of the recruit's safe arrival, then are searched for contraband. They are issued utility and physical training uniforms and toiletries. From here, the males receive their first military haircut, where they are left essentially bald. Females are instructed in the authorized hairstyling, which allows hair to be short enough to not touch the collar or in a bun.

The remainder of receiving involves completing paperwork, issuing a M16A2 service rifle, receiving vaccines and medical tests, and storing civilian belongings under the eye of drill instructors set aside specifically for receiving. This takes approximately three days, usually without the opportunity to sleep, and ends with the Initial Strength Test (IST). The IST is a shortened form of the PFT to assess if a recruit is physically fit enough to begin training. To pass, a male recruit must complete at least 2 pull-ups, 35 crunches in two minutes, and run 1.5 miles in 13:30 minutes or less. The female recruits must hold a “flexed arm hang” (hanging on a bar with their arms bent) for at least 12 seconds, complete 35 crunches in two minutes, and run 1.5 miles in 15 minutes or less.

From this point, recruits experience "Black Friday", where they meet their permanent Drill Instructors. They also meet their Company Commander, usually a captain, who orders their Drill Instructors to train them to become Marines and has them recite the Drill Instructor's Creed. At this point recruit training truly begins. Recruits are familiarized with incentive training as one of the consequences of disobedience or failure to perform to a Drill Instructor's expectations. The Drill Instructors physically, psychologically, and mentally challenge the recruits, including yelling at maximum volume and intimidation, to simulate stress of the battlefield and elicit immediate compliance to instructions. The remainder of receiving is made as confusing and disorienting for the recruits as possible, to help distance the recruits from civilian habits and to prepare them for Marine Corps discipline.

It is at this point that a recruit must come to terms with the decision he or she has made and develop the true determination needed to make it through the process of becoming a United States Marine. The final "moment of truth" is offered to those who have been dishonest about their eligibility, such as drug use, judicial convictions, or other disqualifying conditions.

US Marine Corps Training: Phase One

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 purpose of the first phase is not only to physically challenge, but also to psychologically break down the recruit. At this point, civilian thoughts and habits are considered detrimental to training, so they are squashed during this period by intense physical training, unchanging routines, strict discipline, and heavy instruction. The process is designed to enable recruits to learn to survive in combat situations and generally to adapt and overcome any unexpected situation. One of the principal ideals learned during this period is that recruits are not to think of themselves as individuals; they are not permitted to use first person or second person pronouns. Instead, recruits are required to use third-person referrals, such as referring to themselves as "This recruit" and accomplish all tasks with teamwork. Any actions that put the benefit of an individual over the benefit of the other recruits are not permitted, and recruits are expected to conform to a standard that does not tolerate personal deviance or eccentricities. Speed, intensity and volume when speaking are valued as well.

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.

Close order drill is an important factor in recruit training, and begins from their first formation on the yellow footprints. In the first phase, they learn all of the basic commands and movements, memorizing the timing through the use of "ditties", or mnemonics, that help synchronize a recruit's movements with the rest of his or her platoon. Constant repetition and practice are used to facilitate muscle memory, so that any given movement can be rendered immediately and accurately upon order without hesitation. To aid in this development, drill movements are worked into other parts of daily life, to help increase the platoon's synchronization and muscle memory; this same technique is used with other non-drill activities as well. The first inter-platoon contest, held in the last week of the first phase, is termed "initial drill", where the platoon and junior-most drill instructor are graded as a whole on their performance in close order drill.

During this phase, recruits are familiarized with their rifle. This weapon, never referred to as a "gun", stays with the recruit through the entirety of recruit training, being locked to his or her rack at night, while platoons will stack weapons together under guard for activities where retaining it is impractical, such as swimming. Recruits must memorize the rifle's serial number, the four weapons safety rules, the four weapons conditions, and go through preparatory lessons in marksmanship. In addition, recruits use the rifles in close order drill, and will spend considerable time cleaning their weapons.

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.

By the end of the first phase, recruits can march, respond to orders, pass the first written test, and keep up in physical fitness.

US Marine Corps Training: Phase Two

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.

The third week is called "Firing Week", which ends with Qualification Day. This week recruits are awakened early in the morning to prepare the rifle range for firing. They spend all day running through the Known Distance Course of fire (also known as table 1), in order to practice their marksmanship skills with live rounds. Half of the platoons will fire at the 200, 300 and 500 yard lines (182.88, 274.32 and 457.2 meters), in the standing, sitting, kneeling and prone positions; the other half will mark targets in the pits. Friday of that week is qualification day, where recruits must qualify with a minimum score in order to earn a marksmanship badge and continue training. Those who fail to qualify are given a second opportunity during Team Week; if they fail again, they are dropped and will repeat Grass Week. The Marines are the only branch of the United States armed forces that require the 500 yard line qualification. A trophy is awarded to the platoon with the highest cumulative scores.

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.

Many companies choose to end team week with a weekend "field meet", where platoons will compete in several military-related sports events, such as a rifle assembly race, sprints, a short marathon, an obstacle course race, and a tug of war.

Because MCRD San Diego is located in the center of a dense urban area, it is impractical to conduct rifle qualification and field training there. Instead, recruits are sent to the Edson Range at Marine Corps Base Camp Pendleton for three weeks during the second phase. At the conclusion, they are returned to MCRD San Diego to continue training.

US Marine Corps Training: Phase Three

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.

After this week, recruits return to garrison for the final drill competition, take the final PFT, and take the final written test (which culminates all of their academic and classroom topics); each event has a trophy for the highest-scoring platoon. At this point, recruits will take their MCMAP test and earn their tan belt; those who fail are dropped. Recruits then prepare for the Crucible.

The Crucible

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 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, and includes a total of 48 miles of marching. It simulates typical combat situations with strenuous testing, hardship, and the deprivation of food and sleep. A recruit is given three MREs (previously two and half) and four to eight hours of sleep through the entire 54-hour event. For this event, recruits are broken into squad-sized teams (possibly smaller) and placed under the charge of one drill instructor. West Coast recruits are returned to Edson Range for the Crucible. Parris Island recruits will conduct the Crucible in the derelict Page Airfield on the south end of the depot.

Throughout the Crucible, recruits are faced with physical and mental challenges that must be accomplished before advancing further. Teamwork is stressed, as the majority of tasks are completely impossible without it; each group must succeed or fail as a whole. The others will result in failure unless every recruit passes through together, requiring the team to aid their fellow recruit(s) who struggle in the accomplishment of the given mission. Also stressed are the Corps' core values of Honor, Courage, and Commitment; events sometimes present a moral challenge. Many challenge events are named after Marine Medal of Honor recipients or otherwise notable Marines, and drill instructors will often take the time to read the citation of the award and hold a guided discussion with the recruits to evaluate their moral development. Drill instructors are also vigilant for those recruits who succeed and fail in leadership positions.

Some of the challenges encountered during the Crucible are various team and individual obstacle courses, day and night assault courses, land navigation courses, individual rushes up steep hills, large-scale martial arts challenges, and countless patrols to and from each of these. Often, these challenges are made even more difficult by the additions of limitations or handicaps, such as the requirement to carry several ammunition drums, not touching portions of an obstacle painted red to indicate simulated booby traps, and evacuating team members with simulated wounds.

On the final day of the Crucible, recruits are awoken and begin their final march (known as the "Reaper" march on the west coast). Immediately following this, recruits are offered the "Warrior's Breakfast", where they are permitted to eat as much as they like, even of previously forbidden foods, such as ice cream. Following this is the Eagle, Globe, and Anchor ceremony, where the recruits receive the eponymous emblem, and thereby cease to be recruits, finally becoming Marines. In recent years, this ceremony has been moved to the day before graduation, and signals the start of Family Day.

US Marine Corps Training: Graduation

The final week of Recruit Training is referred to as "Marine Week" and includes the Battalion Commander's Inspection, Family Day, and Graduation. During this week, Marines are instructed in some of the recruit behaviors that are no longer appropriate as Marines, such as referring to self in the third person. Final photos are taken, a representative from the School of Infantry will conduct a brief, and travel arrangements are made for a ten day leave.

The last full day before graduation is called Family Day. The public day begins early with a "Motivational Run", when the new Marines run (by company, then by platoon) yelling Marine Corps Cadences, past their families; circling the base and ending at the parade deck. The newest Marines are dismissed to on-base liberty with their families from late morning until early evening. During the last night, some platoons allow the recruits to host a gong show, where they perform skits regarding humorous moments during training, especially of their drill instructors. Some drill instructors will use this as an excuse to perform incentive training on their platoon one last time.

The next morning, the new Marines form for their graduation ceremony, march across the parade deck, and are dismissed from recruit training by their senior drill instructors.

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