Besides the points answered by Ken I justed wanted to point out that the mortar has traditionally been the mountain infantry's best friend. Not only does it allow you to suppress and target almost everything within range with considerable effect, but it can also do this job deployed behind ridges, on steep slopes and possibly close a good supply route. The FOs/platoon should have the tools and training to make the best use of it.
Sending the vehicle supplied HE from afar is way easier on the backs of the humping soldiers.
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