I believe the requirement to authenticate "Red Cross" armbands by applying a stamp comes from the Geneva Convention. It is possible that the simplified wording of "Army Medical Service" was specified in the original document and is still used.
Here is a brassard from the 1990s - 2000s used in Bosnia.
Tim
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"Manui dat cognitio vires - Knowledge gives strength to the arm"
"Better to know it but not need it than to need it and not know it!"
"Have more than thou showest, speak less than thou knowest."
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