<P> 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 . For example, a recruit is instructed to hold his / her food tray in a similar fashion to holding the butt of a rifle during "shoulder arms". </P> <P> 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 in an armory in the recruit's squadbay at night or when not in use . Platoons will stack their rifles and post a guard on them during situations where retaining them is impractical, such as during indoor classes or chow . 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 . </P> <P> Recruits begin work toward earning their tan belt in the Marine Corps Martial Arts Program (MCMAP). Physical training 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 (from 1.5 miles with a light pack to a 10 - mile hike with full loadout at the end of the Crucible). 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 . </P> <P> In the third week of the first 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 . Certain MOS's require a more advanced swim qualification in bootcamp . Recruits who fail to achieve this qualification may be reclassified into a different MOS . </P>

What do they call marines in boot camp