POLO HAT is an end-to-end communications exercise for United States nuclear command and control forces."Exercise in 2009 simulated nuclear attack on U.S., counterstrike," GeoStrategy Direct, 4 Apr 2010Chairman of the Joint Chiefs of Staff Instruction 5119.01C, 14 Dec 2007
See also GIANT BALL - an Airborne Launch Control System (ALCS) exercise
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