U.S. Marine Officers 
Every year, the U.S. Marine Corps commissions over 2,000 new Marine lieutenants. These officers come in along a number of paths: some graduate from the U.S. Naval Academy, while others are ROTC graduates or former enlisted men who come up through Officer Candidates School (OCS).

Age
A Marine Corps officer must be at least 18 years old, and can be no older than 28. Waivers for this are sometimes available.

Citizenship and Character
All U.S. Marine officers must be U.S. citizens. They must have a clean criminal record. Waivers for past criminal convictions are possible, but are very hard to get.

Physical Fitness
A physical fitness test is required to get into the Marines. This test must be re-performed every six months, and Marines are expected to be able to pass it at any time. It consists of pull-ups, crunches and a three-mile run. The required standards depend on the Marine's gender and age.


Training
Every path a Marine officer takes--ROTC, OCS or Annapolis--requires intense training and hard work. Marine OCS, for instance, washes out about a third of the students in every class.


The United States Marine Corps Officer Candidates School (OCS) is the entry-level training for Marine officers, equivalent to recruit training for enlisted Marines. Located at Marine Corps Base Quantico, the school trains, screens, and evaluates potential Marine Corps officers. Unlike the other United States military services, the majority of Marine Corps officers complete OCS to earn a commission; the exceptions are midshipmen from the United States Naval Academy, limited duty officers, and inter-service transfers.
Depending on the source, Officer Candidates go through either a 10-week, or two 6-week courses over separate summers, designed primarily to screen and evaluate candidates' fitness to lead Marines by placing them in leadership positions in a stressful environment. Students are evaluated during 2-3 day garrison command billets at the company and platoon level, and squad and fire-team level tactical billets during field exercises.


History 

Prior to World War I, Marine officers came primarily from the Naval Academy, or were commissioned from the enlisted ranks. But as the Marine Corps expanded, it needed its own training pipeline for officers. OCS traces its roots to the "School of Application", established in 1891 in Washington, D.C. With the expansion of the Marine Corps for World War I, all instructional efforts were consolidated in MCB Quantico, where they remain today.

Location [edit]

OCS is currently located at Brown Field at Marine Corps Base Quantico. The Platoon Leaders Class Juniors was at Camp Upshur until 1986, but was subsequently consolidated with the seniors at Brown Field.

Selection and entry [edit]

Entry to the Officer Candidates School comes from several different commissioning programs:[2]

• Officer Candidates Course (OCC) for college seniors and graduates

• Platoon Leaders Class (PLC) for college students with one or more years left in school

• Naval Reserve Officer Training Corps (NROTC)

• Enlisted Commissioning Program (ECP) for enlisted Marines with a college degree

• Meritorious Commissioning Program (MCP) for enlisted Marines within 18 months of graduation

• Marine Enlisted Commissioning Education Program (MECEP)

• Officers Candidates School(OCS) is waived for Naval Academy graduates commissioned into the Marine Corps

Officer Candidates must pass a series of tests before being admitted into the Officer Candidate School.[3] An Officer Selection Officer, usually a Captain, meets with a prospective Officer Candidate. Upon completing a satisfactory interview, the OSO then makes the decision to move the prospective candidate onto the next step. The prospective candidate then must complete a short essay about why he wants to be a Marine Officer, provide identification (usually a birth certificate and Social Security card), pass a background check, provide five letters of recommendation, and complete a physical medical exam.

After successful completion of these steps, the OSO may then conduct the Officer Candidate through a Physical Fitness Test. Upon reaching a score on the test that the OSO deems to be acceptable (usually in the range of 285 and above), the Officer Candidate then signs the contract (including the contract to attend the course, the fraternization policy acknowledgement, and the Marine Corps drug policy acknowledgement). Candidates choose to enter the program as either a ground, air, or law contract.

All of this information is sent to a review board, which will vote to decide if the Candidate should be accepted to Officer Candidate School. These review boards generally convene only once a month. After receiving a majority vote of acceptance from the review board, the Officer Candidate is officially accepted into the Officer Candidate Program and scheduled for a class.

Training 

A Sergeant Instructor corrects an officer candidate

OCS screens potential officers using a program designed to test and assess the candidates with an emphasis on confidence and leadership abilities. This includes evaluated events such as the leadership reaction course and small unit leader evaluation exercise.[4]

Regardless of course, the instructors usually include officers to handle most academic instruction, enlisted sergeant instructors (Staff Noncommissioned Officers taken from the drill instructor community) to conduct most of the day-to-day management, and other instructors (most often non-commissioned officers) to teach most field skills. Officer Candidates on both courses have many related expenses (including travel to and from Officer Candidate School, meals, and lodging) paid for them, and receive a stipend while in training to pay for uniforms, books, and other supplies. The Training and Education Command designs the program of instruction for OCS.

Platoon Leaders Class 

The Platoon Leaders Class normally consists of two six-week training sessions taken between consecutive school years, which occur in the summers with no commitment during the school year. Young men and women at any accredited four-year college or university are eligible for this class.

Officer Candidates that attend the Platoon Leaders Class may opt for either the PLC Juniors/Seniors program or the PLC Combined program. In the Juniors/Seniors program, a freshman may attend the PLC Junior course the summer between their freshman and sophomore years, then attend the PLC Senior course the summer before his senior year begins. Sophomores can attend the PLC Junior course the summer before their junior year in school and the PLC Senior course the following summer. PLC Combined is a ten-week program for those interested in completing officer screening during a single summer after completing their junior year in college.

Training includes academic and field topics. Academic subjects covered include Marine Corps history, leadership, close order drill, weapons handling, and general military subjects such as land navigation, the Uniform Code of Military Justice, interior guard, moral and ethical leadership, and basic combat. PLC candidates need to be physically fit as the physical training is demanding, for example, Officer Candidates in a PLC Senior course run and hike an average of 250 miles (400 km) or more during a six-week period.

Those who opt for the Juniors/Seniors program will find that the divided program is tailored to provide progressive training. The Junior course is an introduction into the Marine Corps, and allows the candidates to be evaluated and motivated for a possible commission. Physical training, small unit leadership, and basic infantry tactics are addressed, as well as significant academic instruction. PLC Seniors is an advanced course of indoctrination and contains similar physical training, small unit leadership, infantry tactics, and academics; but at a faster rate and with more instructor-induced stress. Those candidates who opt for the combined course cover the same areas of instruction, but it is integrated without the need to reevaluate candidates due to a year-long gap. NROTC midshipmen attend the PLC Seniors course for their final summer cruise, nicknamed "Bulldog".

Officer Candidates Course 

The main alternative is the Officer Candidates Course, which is designed for college seniors or graduates and enlisted Marines, and consists of one ten-week training session. While the curriculum is identical to the 10-week PLC Combined session, OCC is held three times a year (winter, summer, and fall), and accepts only college graduates. Additionally, graduates of OCC are commissioned immediately upon graduation of OCS.

The Quigley 

The Quigley is a legendary water obstacle used in training at OCS.[5] Lieutenant Colonel William J. Quigley, a veteran of both the Korean and Vietnam Wars, designed it in 1967. It consists of a long canal with 4-foot (1.2 m) cement culverts submerged in swampy, snake infested water; candidates must swim through the Quigley as a part of the OCS training program.

Further training 

Officer candidates who complete OCS (and have obtained their college degrees) are then commissioned as Second Lieutenants and sent to The Basic School (TBS) at Quantico for six months of further training with other newly commissioned Marine officers from all other commissioning programs. At TBS, they receive the skills and knowledge necessary to lead Marines in combat; much like "every Marine is a rifleman", every officer is introduced to the skills necessary to lead a provisional rifle platoon.


Officer Candidates School Official Web Site.
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