There are four possible combinations of blood types namely: Type A (only antigen A), Type B (only antigen B), Type AB (both antigens A and B), and Type O (neither antigens A nor B). This is referred to as the ABO blood typing system. In addition, red blood cells have a Rhesus factor or Rh, which is either present or absent. If the Rh factor is present, the cells are referred to as Rh positive.
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Like AAFES is the Army's version of 7/11, TRADOC is their version of Strayer University. It is not a village, let alone anything, in North Korea. United States Army TRADOC (TRAining and DOCtrine Command) is based in Virginia and, as its title implies, takes as one of its major duties the training of future Army leaders in leadership skills. TRADOC is entrusted with refining military theory, weapons development, and more cool stuff.