English is the international language of business, and the metric system is ubiquitous. Believe it or not, Iranians are capable of learning English. 'HE' is the international symbol for high explosive, and people everywhere know how to use common era notation for the date. If these shells were meant to be used by people who don't speak Persian then it's only natural that they'd be labeled this way.
Since when do Iranians use English? Since long before the 1979 revolution.
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