platoon: a military unit that is a subdivision of a company; usually has a headquarters and two or more squads; usually commanded by a lieutenant
army unit: a military unit that is part of an army
potassium chloride: salt of potassium (KCl) (trade names K-Dur 20, Kaochlor and K-lor and Klorvess and K-lyte); taken in tablet form to treat potassium deficiency