APP-6A/MIL-STD-2525A-B symbol frame for affiliation: friendly; battle dimension: subsurface.
APP-6A, MIL-STD-2525B Change 1
Thibault, D. U.; Commented APP-6A - Military Symbols for Land Based Systems, Defence R&amp;D Canada – Valcartier, Technical Note TN 2005-222 (2005-08-01)
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