A special mission unit (SMU), at one time referred to as a "tier 1" unit, is a designation for the United States military's most highly secretive and elite special operations forces. The term special missions unit is also used in Australia to describe the Special Air Service Regiment.
A special mission unit (SMU), at one time referred to as a "tier 1" unit, is a designation for the United States military's most highly secretive and elite special operations forces. The term special missions unit is also used in Australia to describe the Special Air Service Regiment.
Source: Wikipedia "Special mission unit" · CC BY-SA 4.0
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