I got mine after about 30 Field Proficiency Caches . It rolled pretty good Native Armor , 1270 Electronics , Health LOL and Protection from Elites LOL . So I recalibrated the Health and got a 1232 Armor roll . I don ' t know if it ' s bugged or not , but I use both my Skills and my Toughness doesn ' t move . Is there a place where I can see the increase to Armor ? Also , when both aren ' t on Cooldown , it doesn ' t always show my increase to SP . Either way , I have done only 4 Lexington Runs and got nothing from those . I think Field Proficiency is the best route to get them . Make sure you have XP on your Vest and Kneepads and you ' ll almost always get a FP Cache when you do a Lexington Run . Using Accomplished is also very helpful for getting Caches .