in pairs, known as battle buddies. Battle buddies are sometimes assigned, or can be chosen by recruits when the need to travel arises. Daily schedule A typical day in Basic Training generally follows this schedule. Times can change depending on location, commanding officers, or when drill sergeants see a need for variation. Fire guard and charge of quarters Every night, at least two recruits from the platoon must be awake at any given time. Duties include patrolling their barracks area, watching for fires, cleaning the barracks and watching for recruits attempting to leave the barracks area. They wake the next pair of recruits at the end of their one-hour shift. This duty is called fire guard. Fire guard stems back to the days of wooden barracks and wood-burning stoves. The fire guard would watch the stoves to make sure that the barracks would not catch fire. Since open flames are not generally used to heat sleeping areas any longer, present-day fire guard duty during Basic Training is more an exercise in discipline than a practical necessity, although if the weather gets cold enough, some groups conducting overnight outdoor training will still use a "pot bellied" stove which must be watched to prevent accidental fires. It is primarily used to ensure accountability of personnel and equipment during the night. Charge of quarters, commonly called CQ, functions in a somewhat similar manner. CQ shifts rotate throughout the entire company, with just two recruits from the company staying awake per shift. The actual charge of quarters is the drill sergeant and the pair of recruits staying awake are the "runners", meaning that they perform tasks for the CQ. They perform some of the same duties as the fire guard shift. Only the CQ on duty is permitted to open the barracks doors and the runners must alert the CQ if someone else attempts to enter or leave the barracks. Hands-on training For many hands-on instructional sessions, recruits are transported to other locations on base that specialize in the given subject. For instance, a class on the use of hand grenades is given at a location where a range is already set up with the appropriate props for the simulation, including targets, fake grenades, identification stations, and a live grenades throwing bay. All trainees must throw two live hand grenades to graduate BCT. Split training option The Split Training Option (also known as STO