This can happen no matter what you're doing in game. We've experienced being pulled into the Exfil Dr. Jansen mission even while doing a Contract and clearing a Stronghold. Call of Duty Modern Warfare 3 (MW3) Related Guides. Zombies Mode Walkthrough and Guide. All Zombies Guides The Act 1 Tier 3 mission of Modern Warfare 3 Zombies is titled Sabotuer, and it is both a challenging and rewarding task that the players have to complete to access the successive mission. All Most Firepower MW3 Zombies Mission Objectives. Image Source: Activision via The Nerd Stash. Pack-a-punch your weapon to level 3. Kill 100 zombies with your level 3 weapon. Kill a Megabomb with your pack-a-punched weapon. The first two steps of this mission are simple: pack-a-punch your weapon by two levels in the medium-threat zone. Use a C4 or RPG-7 to destroy the 1st helicopter. 1-3. Make your way to the north building then acquire the SAM Turret and other explosives. 1-4. Go to the 2nd helicopter. 1-5. Use a C4 or RPG-7 to destroy the 2nd helicopter. 1-6. Go to the 3rd helicopter. Loot three Merc Camp Caches. Below is an easy guide to help you complete the Act 2 Tier 2 mission Merc Cleanup in Modern Warfare 3 Zombies: Launch your game and head to the Zombies mode. You will All Act 4 Missions in MW3 Zombies. There is only one mission that makes up Act 4 of the Zombies mode. The one mission is a story mission called Bad Signal.Unlike the other acts that require completing the previous ones to access, anyone can immediately start Act 4 regardless of progress through the launch campaign. Learn how to complete the 14 missions of the Modern Warfare 3 campaign on four difficulty levels and get rewards in the multiplayer modes. Find out the length of the campaign, the types of missions, and the items and weapons you can discover on each map. Tac Mask - Reduces effect of enemy flash and stun grenades. Immune to enemy shock, EMP, and snapshot grenades. Mission Control Commlink - Reduces killstreak cost by one kill / Reduces scorestreak cost by 125. Bone Conduction Headset - Decreaes combat noise allowing better hearing of enemy gunfire and footsteps. e76cYq4.