The Assault Shield is an unusual 'weapon', an almost purely defensive tool that's effective in certain objective modes. It isn't recommended for general deathmatch modes. However, in objective modes the Assault Shield can be valuable in blocking an access route or providing cover from long-range fire while you claim an objective.
Black Ops 2 (II) - Weapons List - Primary Specials
COD: Black Ops II
Xbox 360, PlayStation 3, Wii U and PC. Multiplayer is available on Xbox LIVE (Xbox 360), PSN (PS3) and Steam. Xbox LIVE requires Gold Membership.
COD: Black Ops III
The next Call of Duty game is Black Ops 3 and it will be released on November 6 on current and previous generation consoles. Treyarch's new black ops 3 game features all new weapons, perks, scorestreaks and maps.