as hand-to-hand combat, Combatives or Ground Fighting Technique (GFT). The training often culminates in a competition where each platoon chooses one recruit to compete, the platoons each choose one male and one female. Recruits are also instructed in map reading, land navigation and compass use. These skills are put to the test at the compass course, where recruits are divided into groups and must navigate their way to a series of points throughout a wooded area. Recruits will also tackle Victory Tower and the Teamwork Development Course during week 2. Victory Tower is an exercise where recruits must navigate through several obstacles at extreme heights, including climbing and traversing rope ladders and bridges. They must then rappel down a 50-foot wall (back-first, with rope harness). In the Teamwork Development Course, squads must navigate a series of obstacles, with emphasis on working as a team rather than as individuals. First aid training, known as Combat Life Saver (CLS), is also given during this period. Recruits are trained in evaluating and properly treating casualties, ranging from dressing a wound to application of a tourniquet and dehydration treatment. Week 3 Recruits begin training with pugil sticks, methods for carrying an unconscious or immobile person and physical problem solving, such as finding a way to carry equipment from point A to point B given specific obstacles and constraints. Recruits are also commonly sent to a gas chamber during this week, which is a large, sealed chamber where soldiers are subjected to CS gas while wearing their protective masks. The gas chamber is the culmination of a series of classroom instructions on gas mask use. Recruits are forced to unmask just before exiting the chamber so that they can briefly experience the effects of the gas. Drill sergeants will usually ask each recruit to recite information while they are unmasked, such as name, social security number or the Pledge of Allegiance, so that the recruit is forced to open their mouth/eyes and/or take a breath while demonstrating continued focus. Week 3 is also when the recruits are introduced to their standard-issue weapon, the M16A2 assault rifle or the M4 carbine. This does not yet involve the actual firing of the rifle. It does include basic rifle marksmanship (BRM) fundamentals training (instruction in marksmanship techniques without firing the rifle. For instance, trigger control is practiced by placing a wooden dowel down the barrel of the rifle