Mobile Task Forces are groups of specially-armed forces dedicated to the SCP Foundation, with each Task Force group performing specific functions. The amount of units in an individual squad can range from 3 to over 20. Each Task Force is assigned a unique combination of a Greek letter and a number, as well as a code name.

Epsilon-11, codenamed Nine-Tailed Fox, is a Task Force specializing in the protection and re-containment of SCP items kept at the site the game takes place in. They are the primary MTF unit encountered in SCP - Containment Breach and are comprised of nine members, each member representing and identified as one tail in the groups namesake. They wield an FN P90.

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