Final answer:
Officer Candidate School (OCS) usually lasts from ten to seventeen weeks, depending on the branch of the military. This training differs from reserve commitments, which were traditionally 'one weekend a month, two weeks a year' but have been increased to up to seven weeks per year.
Step-by-step explanation:
The question pertains to the duration of Officer Candidate School (OCS), a training and indoctrination program designed for prospective officers. The specific length of OCS can vary by branch of the military, but generally, OCS programs last from ten to seventeen weeks, depending on the particular branch of the armed forces. It's important to distinguish this from reserve drills, which have historically been summarized by the slogan "one weekend a month, two weeks a year."
However, as military commitments have evolved, especially in light of the Iraq War, there have been significant changes. Notably, Army reservists saw their annual drill requirement increase from the traditional two weeks per year to potentially up to seven weeks per year. This change reflects the greater demand and reliance on Reserve components and has been mentioned by the Army's top general as of July 2012. While this information about reserve service doesn't directly answer the OCS duration, it contextualizes the current state of military training expectations.