JROTC classes are divided up into four main periods called Companies. 2nd period is Alpha Company, 3rd is Bravo Company, 4th is Charlie Company, and 8th is Delta Company. There is also 1st and 5th period which used for cadet staff development and rifle and drill for varsity team members to practice. Each Company has three main leaders. The commanding officer (CO), or company commander, is the main person in charge who creates a plan for the company's learning and activities. The executive officer (XO) is the CO’s assistant, and the first sergeant (1SG) carries out the orders of the CO and XO, and basically runs the company and works directly with the cadets.