According to a Marine Corps website, the mission of Officer Candidates School is to train, screen and evaluate candidates. The training includes both academics and physical training such as endurance hikes and obstacles courses. Candidates are evaluated on leadership potential as well as moral, physical and academic strengths. Candidates must also demonstrate a grasp of battlefield-tested leadership traits, the website says.
Marines become second lieutenants on graduation from the school's 10-week program.
In 2010, the Quantico base was one of several targets of an ex-Marine reservist who, during five nighttime shootings, fired on military targets including the Pentagon. Yonathan Melaku, on two separate occasions, fired at the National Museum of the Marine Corps in Quantico. No one was injured and Melaku was ultimately sentenced to 25 years in prison.