The Army's Officer Candidate School is programmed to teach basic leadership and soldier tasks, using the infantry battle drills found in Army Field Manual 3–21.8 as a framework for instruction and evaluation of leadership potential. A total of 71 tasks are taught and tested while at OCS. A candidate should expect to be under constant observation and evaluation by their cadre. Mental and emotional stress is induced through a variety of controlled methods, to test problem-solving and moral resolve. Additionally, the course is meant to be physically demanding, with numerous tactical road marches, timed runs of varying distance from 2 miles to 5 miles, and Army Combatives training. Beginning with the first class of FY 2008, the calendar length of OCS was shortened from 14 weeks to 12 weeks, thus allowing for more classes to be conducted each fiscal year, thereby raising the maximum capacity of the school to train Second Lieutenants to meet future commissioning needs as the Army grows. The current capacity of each class that is conducted is limited to 160 officer candidates.