During the “MBA Launch” week, each incoming student is randomly assigned to one of four cohorts – Red, Green, Blue, and Purple. The classmates in the same cohort not only take classes together for the next two years, but also participate in many extracurricular activities (?) as well. (I’ve seen many couples from the same cohort who later became a husband and a wife!) Once a year in the fall, there is a WWIII among the four cohorts for bragging rights. They absolutely don't take any prisoners during the war.