First place in the Imperial Stormtrooper Marksmanship Academy.
::What was the coolest military unit of all time?::
Let's add the Ocēlōpilli, the Jaguar Warrior of the 'Aztec Empire'.
The Jaguar Warriors were recruited from the mācēhualtin, the Mexica lower class (unlike the Eagle Warriors, recruited from the nobility), and were the shock troops of the Mexica Hegemony.
If going to war with a wooden sword studded with obsidian blades, dressed with a jaguar skin and wearing a head ornament made of quetzal feathers is not cool, I don't know what it is.