Achilles tendon -- the strong tendon joining the calf muscles to the heel bone API -- assistant primary instructor AR -- Army regulation brachial plexus -- a network of nerves in the armpits, supplying nerves to the chest, shoulders, and arms cardiorespiratory -- pertains to the heart and lung system carotid artery -- the pair of main arteries that supply blood to the brain via the neck cervical vertebrae -- neck and upper spine bones clavicle -- collarbone common peroneal -- having two or more branches and located between the knee and ankle cranial -- the skull DA -- Department of the Army DSN -- defense switched network dysfunction -- impaired or abnormal function femoral nerve -- the chief artery in the front part of the inner thigh FM -- field manual FSN -- federal stock number garrote -- strangulation with a rope or wire IAW -- in accordance with LCE -- load-carrying equipment METL-- mission essential task list No -- number NSN -- national stock number OIC-- officer in charge OSUT -- one-station unit training pectoral muscle -- muscles that connect the ventral walls of the chest with the bones of the upper arms and shoulders peroneal nerve -- a nerve located near the fibula PI -- primary instructor POI -- program(s) of instruction PT -- physical training PVC -- polyvinyl chloride S3 -- operations and training officer sanguineous strangulation -- a violent, bloodthirsty strangulation sciatic nerves -- a pair of large nerves that pass out of the pelvis and down the back of the thigh solar plexus -- the pit of the stomach stellate ganglion -- a star-shaped mass of nerve tissue external to the brain or spinal cord subclavian artery -- part of the main artery of the arm or forelimb suprascapular nerve -- a nerve on top of the shoulder TC -- training circular trachea -- the main trunk of the system of tubes by which air passes to and from the lungs trapezius -- a large, flat, triangular muscle on each side of the back TSC -- Training Support Center US -- United States vagus nerve -- cranial nerves that supply the heart and lungs with sensory and motor fibers