Pun fired more than 400 rounds, launched 17 grenades and detonated a mine to repel the Taliban assault on his checkpoint near Babaji in Helmand Province, southern Afghanistan, last September.
Surrounded, the enemy opened fired from all sides and for 15 minutes Pun remained under continuous attack, including from rocket-propelled grenades and AK47 guns.
At one point, unable to shoot, he used his machine gun tripod to knock down a militant who was climbing the walls of the compound.
Two insurgents were still attacking by the time he ran out of ammunition, but he set off a Claymore mine to repel them.
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