I did a bit more digging. Based on the style of the grille and headlights I think it is between 1980 and 1986. 1979 and earlier had round sealed beam headlights and 1987 went to the large composite lenses.
Keep in mind that they might have kept using old style parts for an extra year or two to complete a military contract, not likely given the small number of Broncos in the fleet but possible.
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