Players who receive voice chat warnings or in-game voice communication penalties can still play the game. However, per the Offensive Behavior section of the Call of Duty Security and Enforcement Policy, extreme or repeated offenses may lead to a permanent suspension from playing the game online.
Taskforce 141 is the name of a multinational special forces group under the command of Lt. Gen. Shepherd. It's recruits come from multiple special forces units around the world including the S.A.S, 75th Ranger Regiment and Canadian Special Operations Regiment.