This marks the first of two occasions you play as Lian Xing. Remember that her default pistol, unlike Gabe's is NOT suppressed. That said, switch to the EDT or gas darts and stalk the soldiers, one by one. Alternatively, you can use the knife on them. Be aware that if you're spotted or a weapon is fired, enemies will rush you - a new wave for each data drive you find. There are 3 drives, which means 3 waves. Killing the first trio silently will not cause an alert.