When Winter Contingency is started up at Legendary, quickly run to the place where the Moas will come from. One will see some creature walking towards that same place, better viewed in Theater Mode shows that it actually is a Special Ops class Elite.
This can only be done on Legendary Difficulty. The Elite will disappear when it's around the corner. The Elite is wielding a Plasma Repeater. The Elite holds one of the Data pads and must be killed to obtain it.