Symbology Standards Management Committee (SSMC) Standards
~ MIL-STD-2525B, Common Warfighting Symbology, 30 January 1999
~ APP-6a is the NATO standard for military map marking symbols
~ original version, APP-6 is from 1986, and APP-6a was adopted in 2001
~ NATO standardization agreement that describes APP-6(a) is STANAG 2019
~ in the United States, it is known as MIL-STD-2525B