Four is the sacred number of the Zia and can be found repeated in the four points radiating from the circle. A resolution was passed in 2014, by the National Congress of American Indians to recognize the Zia pueblo’s right to the symbol. The symbol was featured on the flag of Madison, Wisconsin from 1962 through 2018, when concerns about cultural appropriation of the Zia, Puebloan, and New Mexican symbol led the city to remove it. In early 2004, the DOD canceled the experiment due to concerns about security issues, ending the program before the implementation phase. In 2001 the DOD began to design the Secure Electronic Registration and Voting Experiment (SERVE). The two design teams introduced several innovative concepts and systems never before seen on a modern warship. Finally, two 57-millimeter close-range guns fire 220 rounds per minute from the bow of the ship. The first two ships in the class are currently being built, with a targeted delivery date of 2012. When it's commissioned, the DDG 1000 Zumwalt will replace older destroyers of the Spruance class (DD 963 - DD 997) and will complement ships in the Arleigh-Burke class, ushering in a new era of naval warfare.

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