I got it quite easily. Tips: -having a bad game/connection? Unequip the last word and try the next game. -having constant trouble progressing? Unequip last word until your super is charged or heavy ammo drops, then re-equip and reign havoc. -multi kill medals and killing sprees ie merciless, reign of terror etc. Provide bonuses. For me when ever heavy ammo dropped I used an LMG, waited out the initial rocket exchanges and got merciless sprees almost every time heavy dropped, sometimes chaining into 15+ kill streaks across two heavies (bridged with normal and super kills in between)