History
APP-6A was promulgated in December 1999. The NATO standardization agreement that covers APP-6A is STANAG 2019 (edition 4), promulgated in December 2000. APP-6A replaced APP-6 (last version, July 1986), which had been promulgated in November 1984 (edition 3 of STANAG 2019 covered APP-6), and was replaced in turn by APP-6B in 2008 (STANAG 2019 edition 5, June 2008) and APP-6C in 2011 (STANAG 2019 edition 6, May 2011).
The U.S. is the current custodian of APP-6A, which is equivalent to MIL-STD-2525A.
Read more about this topic: NATO Military Symbols For Land Based Systems
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