United States Marine Corps

===Initial training===
{{main|United States Marine Corps Recruit Training|Officer Candidates School (United States Marine Corps)}}
[[File:Marine recruits.jpg|thumb|Marine recruits at Marine Corps Recruit Depot San Diego]]
Every year, over 2,000 new Marine officers are commissioned, and 38,000 recruits are accepted and trained.<ref name="ChenowethNihart"/> All new marines, enlisted or officer, are [[military recruitment|recruited]] by the [[Marine Corps Recruiting Command]].<ref>{{cite book|title=Marine: a guided tour of a Marine expeditionary unit|first=Tom|last=Clancy|author-link=Tom Clancy|page=[https://archive.org/details/marineguidedtour00clan/page/46 46]|publisher=Penguin|year=1996|isbn=978-0-425-15454-0|url=https://archive.org/details/marineguidedtour00clan/page/46}}</ref> 

Commissioned officers are commissioned mainly through one of three sources: [[Naval Reserve Officer Training Corps]], [[Officer Candidates School (United States Marine Corps)|Officer Candidates School]], or the [[United States Naval Academy]]. Following commissioning, all Marine commissioned officers, regardless of accession route or further training requirements, attend [[The Basic School]] at Marine Corps Base Quantico. At The Basic School, second lieutenants, warrant officers, and selected foreign officers learn the art of infantry and [[combined arms]] warfare.<ref name="Estes" />

Enlisted marines attend [[United States Marine Corps Recruit Training|recruit training]], known as ''boot camp'', at either Marine Corps Recruit Depot San Diego or Marine Corps Recruit Depot Parris Island. Historically, the [[Mississippi River]] served as a dividing line that delineated who would be trained where, while more recently, a [[Marine Corps Recruiting Command#Structure|district system]] has ensured a more even distribution of male recruits between the two facilities. All recruits must pass a fitness test to start training; those who fail will receive individualized attention and training until the minimum standards are reached.<ref>{{Cite web|title=Marine Corps Initial Strength Test - MarinesBootCampHQ.com|url=https://www.marinesbootcamphq.com/marine-corps-initial-strength-test/|access-date=22 November 2021|language=en-US}}</ref> Marine recruit training is the longest among the American military services; it is 13 weeks long including processing and out-processing.<ref>{{cite book |title=Recruit Medicine: Textbooks of Military Medicine |editor= Bernard L. DeKoning |page=33 |publisher=Government Printing Office|year=2006 |isbn=978-0-16-076718-0}}</ref>

Following recruit training, enlisted marines then attend [[United States Marine Corps School of Infantry|The School of Infantry]] at [[Camp Geiger]] or [[Marine Corps Base Camp Pendleton|Camp Pendleton]]. Infantry marines begin their combat training, which varies in length, immediately with the Infantry Training Battalion. Marines in all other MOSs train for 29 days in Marine Combat Training, learning common infantry skills, before continuing on to their MOS schools, which vary in length.<ref>{{cite book|title= Making the Corps: 10th Anniversary Edition with a New Afterword by the Author |first= Thomas E. |last= Ricks |author-link= Thomas E. Ricks (journalist) |page=239 |edition=10 |publisher=Simon and Schuster |year=2007 |isbn=978-1-4165-4450-0}}</ref>